Everyone already knew about Hardik and Rahul's off field activities (Apparently they are popular with girls). They just talked about it on the show, except Hardik was rather crass about it.
Things like announcing to his parents how he lost his virginity, his affairs and the black thing ( he thinks of himself as a West Indian and to be fair to him his West Indian teammates at Mumbai India have said the same countless times, like how he is born in the wrong country and should have actually been a West Indian). He said that like a West Indian he first sees how the girl moves on the dance floor before making the move because it's important for later (read sex). And lastly, his favourite pickup line, "Hi, I'm Hardik always".
Personally I thought it was just cringe and the sexist remarks deserved the criticism, which he got from all quarters and for which he apologised. But banning him for that is just daft. And Rahul getting the punishment for simply being part of the show is just wrong.