I think you have to factor in that it was like, the 110th minute and everyone's tired and frustrated. If it happened earlier in the match I'm sure Zidane would've probably just walked away. I don't know, I've been reading a bunch of different things that was said, and it's most likely that the Italian guy said something racial to him. It's said that Zidane is going to speak out later in the week, so hopefully he'll say what happened.