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.
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