I think it would be extremely difficult to have not one person under the circumstances, whether alcohol was involved pre-game or not, go over the line under the heated situations of an Inter-Juve rivalry and a sh*t-disturber like Balotelli on the pitch.
Of course, the irony here being that juventini in the stands probably hurled a lot worse abuses at the guy. But all it takes is a mild-by-comparison racial epithet to register for any condemnation. Not to excuse that behavior, but as a society we do draw some curious lines between what's considered acceptable and unacceptable hate speech.