How To Deal With This Situation?-Male Bully Female Victim?

This guy in my cl randomly stood up in the middle of cl and yelled at me and my friend to "SHUT THE F**K UP!" because we were softly whispering about something in cl that we didn't understand or something. He was on the other side of the room so he couldn't have heard us. Today, my friend tells me that he was posted on his facebook that one of us is "melon ****" and I know that's me because I have the bigger of us two. but they aren't as big as MELONS! UGH! So how do I handle this situation? This other girl who used to be nice to me is now joining him on facebook and making fun of us. I really don't want to deal with this my senior year of high school. I have a cl with this guy and I sit next to him in it and I've always helped him with the work when he's asked me. this other girl who is talking **** is in a cl with me n him n this friend of mine. do i go to the principal? wont he just be more mean to me? thanks!!