you can verbally rip them a new one if they're worth fighting. In that regard, don't do anything stupid like bring it up on the internet unless you want to deal with people from your school or some shit since it seems like you're harassing and or instigating something. don't fight unless he starts it first and swings first. And for the love of god don' t pull this shit at school. Then it's ok to fight. I've never seen a reason for just plain cold-cocking somebody out of the blue. If you don't have the capacity to vocally express your discontent then you should probably examine your opinion on whatever subject.
That being said watch out for haymakers and wrestlers. Good luck