This year's Celebrity Big Brother, which saw rapper Coolio the focus of many complaints, did not breach broadcasting rules, Ofcom found today.
The regulator received 527 complaints about the show, eventually won by Ulrika Jonsson, the majority relating to viewers feeling that housemates had been bullied.
Today's ruling comes more than two years after the Celebrity Big Brother race row, which Ofcom previously found did break the broadcasting code.
In May 2007, Ofcom found that Channel 4 was guilty of "serious editorial misjudgment" over its handling of the row.
The 2007 series of the show sparked an international outcry over the treatment of Bollywood star Shilpa Shetty by housemates Jade Goody, Danielle Lloyd and Jo O'Meara.
This year's show, broadcast in January, saw complaints about the manner in which Coolio behaved towards women in the house, including former Liberty X singer Michelle Heaton.
Some viewers felt that his behaviour was sexist, but Ofcom also received complaints that he was negatively stereotyped as an aggressive black man.
Ofcom noted that the show has various mechanisms for challenging inappropriate behaviour, such as discussion in the Diary Room.
It also noted that celebrity contestants are paid a fee for taking part and are free to leave if they feel they have been unfairly treated.
The regulator said: "It appeared clear to viewers that Coolio enjoyed baiting and teasing female housemates.
"However, when Coolio teased Michelle for allegedly having feelings for another housemate (Ben Adams) she became very upset.
"Sensing he had hit a nerve, Coolio continued to tease her about it."
Ofcom said that Big Brother talked to Heaton and Coolio separately in the Diary Room and Heaton appeared comforted.
Coolio appeared genuinely disconcerted when told that some of his behaviour could be seen as intimidating, the regulator found.
The pair apologised to each other and the feud was settled.
Ofcom said: "In Ofcom's view Coolio was a 'larger than life' character in the house, playing the role for many viewers of the 'villain of the piece' where such a role, after 10 years of Big Brother, is generally expected by the audience."
It said that Coolio was at times "generally unpleasant" but it was important that Channel 4 reflected what happened in the house accurately.
Ofcom concluded that this series complied with the rules because "any potentially offensive content that was shown and the manner in which the friction and the arguments were handled and presented by Big Brother on behalf of Channel 4, were adequately justified by the context".
Channel 4 welcomed the ruling about this year's show, saying in a statement: "Conflicts can arise within the Big Brother House, but both the producers and commissioning editors encourage housemates to work differences out amongst themselves initially.
"Channel 4 has robust procedures in place to safeguard housemates' welfare and avoid any harm or offence to fellow housemates or viewers, and Big Brother will intervene as and when necessary."