If a guy says "what the fuck did you say to me", "what the fuck are you looking at", "did you call my girlfriend a ......" etc etc I will say "no mate, sorry, didnt mean to give offence, dont want any trouble etc etc". If hes just a scrapper looking for a fight, he will snarl at you and go look for someone more interesting, hes just a guy who likes to fight and is too dumb to get his arse in a gym. If I want to scrap, I can, anytime, in a controlled environment with class opposition. The guys that keep pushing once you essentially verbally submit, those are bullies. They grow in size and get more aggressive the more scared the person they are intimidating "appears" to be. I hate bullies above all things. Bullies who just look for people weaker than them to prey on make me deeply and irrationally angry. I generally play along, for a while. There is absolutely nothing I find more satisfying than the change in a bullies face from self satisfaction and sadistic pleasure to raw terror. I make no apologies for this. More people should do it.
I have not actively picked a fight since I was 14. That guy was a boxer. He beat the living shit out of me!