I'm gonna be honest, kicking the shit out of a nerd because you don't agree with his words is not as cool as you seem to think.
Sure he was "wrong," but did anyone try "please leave, we no longer wish to discuss these matters with you" before jumping to initiating violence? Multiple attackers no less (which would meet the threshold of deadly force in most states, luckily for them not Greece).
Back in my day children were taught to use their words, but I guess immature adults that are incapable of doing so still have to bully people physically, sucks to suck I guess, get eloquent losers.