It's theoretically true but no one takes that as a racist saying even though it has to go both ways, otherwise, this is exactly where the racism happens. Fining the fans for booing a black player but then letting such a thing go when it comes to the white players of different nationalities is racist towards the BLACK player: Because you're weak, because you are poor, because you're black, we support you.
At some cases, yeah I agree with you. Some of them are touchy and love the drama. But this one is very clear Hoori. Italians (Some/most) are racists, I know how they treat foreigners and specially the blacks. I saw that day on news how people of some Italian village or small city went mad against the black people who work there, they forced them out of that area, that was terrible.
This is the case with Balotelli, I hate to defend that prick, but that is the reality. He is born and raised in Italy, so he should be all welcomed to play in the national team, but some of Italians are against that. Why? Because he is not white, and not because of his behavior. Cassano was an idiot like him too, but no one did anything ugly like this against him when he was called, why? Because he isn't black, he is one of them, blacks are the "other" people for them..