Why Aamir and Salman fought at a party?

Not long ago they were being hailed as great friends in Bollywood. Both were seen together at all happy and sad moments in each others lives. The family was also very close. Then what went wrong? Why are the two super Khans of Bollywood, Aamir and Salman fighting. Actually if we look closely it was two friends fighting over a trivial issue, as the two teenagers fight. During a party at Samir Khan's house Aamir teased Salman by saying that if Salman had chosen matured roles as that in Bajrangi Bhaijaan his career as an actor would have looked better. Hearing the Salman got irked and teased Aamir by saying that he at least gives credit to his director unlike Aamir.