For future reference, 2nd year or later students at this point would be hesitant at best to mess with a faunus, since pretty much all of them know about Agrus Grau of team WGRN hospitalizing Cardin while protecting his younger cousins. New students are going to be more prone to it, but they will learn better VERY quickly.
tl;dr, don't expect too much punishment if he fucks up some racist asshole in self defense.