When you see a homophobe beat up someone because of their sexuality.

Ok story time:
I was sitting in a science group of a few people (all were homophobic, who didn't know i was Bi) so anyway, this kid admitted to beating up his gay friend for "making a move" on him. Then he said "I don't normally beat people up for no reason, but this was a valid reason. He was gay." Yeah, I was pissed.