Big Brother viewers have complained to Ofcom after Caroline Wharram described black contestant Adam Kelly as a "gorilla".
In an argument on Thursday night's show the 20-year-old ex-boarding school pupil said: "He's just a ridiculous gorilla - bowl haircut, no sanitation."
They were reportedly clashing over a task that saw Adam spin her on a roundabout while she attempted to eat three jars of sweets.
Caroline was given a formal warning by Big Brother and later apologised to Adam, telling him: "It's not a personal attack... Obviously you are not a bully, I am."
This week also saw a women's group condemn Channel 5 and Big Brother bosses over a "bullying" row on the programme which sparked almost 1,000 complaints.
Viewers saw housemate Conor McIntyre in a heated row with fellow contestant Deana Uppal earlier this week.
The Northern Irish personal trainer lost his temper with the 23-year-old beauty queen after she failed a task, launching a verbal attack on her during which he threatened to punch her. He was later reprimanded.
Holly Dustin, director of the End Violence Against Women Coalition, said: "It is highly irresponsible of Channel 5 and the makers of Big Brother not to have immediately removed Conor McIntyre from the house, but to leave a woman in a confined space with someone who has made threats of physical and sexual violence against her.
"Merely giving McIntyre a ticking off in the diary room sends a very harmful message to young people that abusive behaviour towards women is entertainment and not very serious.
"We look forward to hearing Ofcom's response to the high number of complaints they have received."
McIntyre lost his temper with Uppal for failing the "Confusing Cuisine" task set by Big Brother. She chose a cake to eat, but was left gagging when she bit into it and found it was made of ham and hot sauce.
He fumed: "For f***'s sake, Deana, eat it."
And McIntyre later ranted: "I'm gonna play loads of pranks on her. F***ing piece of s***, I don't give a f*** if I'm pulled up to the Diary Room. He added that he would punch her.
The 24-year-old from Derry was then called to the Diary Room to be told off by Big Brother, and reminded of the rules about aggressive behaviour and threatening, bad language.
Channel 5 said he had been warned about his behaviour but producers were satisfied he should continue in the show.
The station said in a statement: "Housemates are closely monitored at all times in the Big Brother house and following Conor's reaction to Deana failing the food-based task he was immediately called into the diary room, warned and reprimanded in accordance with the programme's procedures.
"He has fully acknowledged that this was unacceptable. We felt it was important to show that Conor's behaviour was not condoned by Big Brother or any of the housemates, and that this kind of conduct will not be tolerated in the house.
"Having spoken to Conor, and bearing in mind our duty of care to the other housemates, we are satisfied that he should continue to participate in the programme."