The Olympic swimmer became the target of famously controversial Frankie's comments after he said she had an advantage at the Games due to her "possessing a dolphin's face".
Speaking to the Daily Mail, the London 2012 bronze medalist has said she believes people who take the time to post "nasty" comments online are "quite sad".
"I'm one of those people who thinks if you haven't got anything nice to say, don't say it.
"I think it's quite sad that people take the time to be nasty. I wouldn't ever write abuse on Twitter. But that's how the world is, I've had to get used to it and not get caught up in it."
She also added that she was not bothered about her appearance, especially after racing in the pool.
"I don't look good in post-race interviews," she said. "My hair is wet, I'm bright red from racing and working hard. I don't focus on trying to look good then.
David Walliams was just one of the stars to defend Rebecca and hit out at Frankie's comments, calling them "disappointing".
He tweeted: "I have met and spoken on the 'phone to double Olympic Gold Medal swimmer Rebecca Adlington. And she is a beautiful woman, inside and out.
"It is disappointing that anyone would want to be mean about her appearance. Rebecca's an absolute inspiration, and a really lovely lady."
Frankie previously hit out at the swimmer following the Beijing 2008 Olympics when he likened her to "someone looking at themselves in the back of a spoon" on Mock The Week. His comments were investigated by the BBC Trust after they received 75 viewer complaints.
> IN PICS: CELEBS ON TWITTER
Twitter ID: AlanCarr Good, bad or mad? Definitely good. Chatty Man Alan is one of the most consistently funny celebs on our Twitter feed. And most importantly, he knows that less is more. Sample tweet: Companies - don't be sh***y then when i ring up to complain get all giggly and say is that THE Alan Carr. Be sh***y 24/7 please!! PA
Twitter ID: calvinharris Good, bad or mad? Good. The lanky Scottish dance music producer comes across more like a funny mate than a celeb - and always interacts with his followers. Sample tweet: Can somebody please think of a joke with the punchline 'because William Shatner' ? -been trying for last 2 hours + given up PA
Twitter ID: charliesheen Good, bad or mad? Mad as a lorry. The winningest warlock in showbizland gained two million followers in a day or two when he joined - and hasn't disappointed with a series of inspired and deranged tweets. We think he's swapped crack for Twitter addiction. Sample tweet: the title of my book has finally been delivered thru vast and extensive Lunar channels. "Apocalypse Me" Warlock Latin for WINNING. c PA
Twitter ID: CherLloyd Good, Bad or mad? Good. You might be surprised that we're fans of Cher, but she always keeps it real on her Twitter and has a nice sense of fun - even when teased about her gypsy heritage. Sample tweet: keep chuckin those gypsy comments in, i'll tarmac ya drive and trim ya hedges for ya if ya like? No shame in me :L PA
Denise Van Outen
Twitter ID: denise_vanouten Good, bad or mad? Good. She mostly tweets to ask for parenting advice or stoke her feud with Natalie Cassidy - but that's fine by us because we can tell she really loves Twitter. Sample tweet: the Karvol plug in is working wonders. I'm high as a kite! No blockages in this house tonight PA
Twitter ID: 50cent Good, bad or mad? Very bad. When he first hit Twitter we thought he was hilarious, then we realised he wasn't really putting on the angry gangsta act - and that he's actually a bit of a dick. Sample tweet: ok no homo is officially banded from my time line. If you choose a alternative life style that's your business. Sh*t I'm a PIMP lol PA
TwitterID: therealgokwan Good, bad or mad? Good. We like Gok because he's funny, self-depreciating and takes the time to answer his followers. Sample tweet: Why is it when you need a wee you always hit roadworks? My driver is getting nervous as I've just asked him if he has an empty bottle! X PA
Twitter ID: planetjedward Good, bad or mad? Absolutely barking mad. We should really un-follow them because they spout such a huge amount of nonsense - but there's something strangely compelling about their ramblings. Sample tweet: We are taking over the world ha ha ha ha not really just holding it like a bubble and then we will burst it and make a stronger cool bubble PA
Twitter ID: kanyewest Good, bad or mad? All three. Sometimes he can be smart and funny, sometimes he can be a berk and sometimes we have no idea what he's on about. Sample tweet: Dude from Muse just gave a shout out to "His Beautiful Pregnant Girlfriend" sounds like a good album title! PA
Twitter ID: MissKatiePrice Good, bad or mad? Good. Yep, that's right - we said good. Why? Becuase Britain's most hated woman (trust us on that) is never afraid to pick up her iPhone and tweet a quick comeback when she's in the news. She keeps us in business. Sample tweet: Mmm in the jacuzzi chillaxing my legs and knee hurting haha then eating my roast dinner and getting my nails done haha x PA
Twitter ID: MissKellyO Good, bad or mad? We can't decide. We used to like her, but then she started sticking it to Dannii Minogue in defence of her hateful mother Sharon. And she seems to have got a bit dull since she got thin too. Sample tweet: over it! the toilet over flowed due to a mystery log rider so i spent the last 2 hours walking around my apt dry heaving! PA
Twitter ID: KimKardashian Good, bad or mad? Good. We love Kim because she's so down to earth for someone you'd expect to be a bit up themselves. She just seems quite nice, and that counts for a lot with us. Sample tweet:< I just drove for the 1st time in NYC! Got a little scared driving over a bridge, I'm afraid of heights...but the tunnel was cool! PA
Twitter ID: lilyroseallen Good, bad or mad? Good. Lily is another celeb who keeps it real on Twitter - using it in just the same way that us mere mortals do. Sample tweet: On police,camera,action,why are the police always addressing the drivers they pull over as 'mate' ? Seems patronising, and antagonistic. PA
Twitter ID: ElizabethHurley Good, bad or mad? Really good, surprisingly. We were expecting Liz to be all stuck up, but she's honest, open and funny on Twitter. Sample tweet: Who's guilty of reading cookery books in bed, particularly when dieting? Eyeing them now...Martha Stewart Cakes looks tempting. PA
Twitter ID: louiespence Good, bad or mad? Good. He may be a shameless attention whore, but Louie's Twitter feed is just as entertaining as his outrageous TV appearances. We love the steady stream of snaps showing him with different celebs. Sample tweet: Going to buy myself a new Lycra cat suite I'm 1 of the judges on Let's dance this sat night you've got to make the effort,may b a backless 1 PA
Twitter ID: ParisHilton Good, bad or mad? Good or bad, we can't decide. OK, so most of her Twitter feed is filled with plugs for her TV shows or products - or thinly-veiled boasts about her hollow, consumerist existence - but somehow we wouldn't want her to be any other way. Sample tweet: Flying back home from the race. Love Helicopters, such incredible views of Vegas and beats the traffic :) PA
Twitter ID: peaches_g Good, bad or mad? Good, but a bit mad too. Of course there's plenty to dislike about Peaches - she comes across like a pretentious student a lot of the time - but her obvious enthusiasm for Twitter and her complete lack of discretion have won us over. Sample tweet: Watching Take Me Out is like watching meat swinging sadly in an abattoir. PA
Twitter ID: piersmorgan Good, bad or mad? Bad. The hardest-working schmoozer in the business came to Twitter late, but has certainly madeup for it with a seemingly never-ending stream of tweets designed either to promote himself or ingratiate him with other celebs or sports stars. Sample tweet: Got to be one Brit celebrity who thinks he can beat me on followers, isn't there? Going to be very dull if they all keep rolling over. PA
Twitter ID: rustyrockets Good, mad or bad: He used to be good, but he seems to have lost his Twitter mojo a bit since hooking up with Katy. That's unfair actually - it's since he got all Hollywood big time that he doesn't seem to put as much effort into his tweets. Sample tweet: Brazil! Happy Marde Gras! Britain! Happy pancake day. Who needs nude street festivals? Pass the lemon juice. PA
Twitter ID: stephenfry Good, bad or mad? Bad. Controversial as it may be, we'll admit that his tweets bore us senseless and we eventually had to un-follow him. It's like being trapped inside the head of a very self-absorbed stranger. Sample tweet: I first tweeted from a plane two years ago, also an internal US flight. Wonder when it'll come to international flights. PA
Twitter ID: wossy Good, bad or mad? Good. Unlike when he's on the telly or radio, Wossy seems to know when enough is enough on Twitter - and he's genuinely funny as well. Sample tweet: Went to see Burlesque with my girls the other day. Cher has now had so much work done she can only talk Klingon.Top lip completely immobile. PA
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