What do I do when they make fun of the guy I like?

Ok in private tell them how you feel and that you like hime and dont like them making fun of him. If they are true friends they will leave him alone and repsect your wishes. You sound like your in school and I know it can be tough so just do what you know is right and follow your heart, you don't want to lose friends but if they dont repect your wishes how good of a friend are they. Good luck