How do you deal with bullies? There is this kid Derek that keeps calling my cousin stupid and a dumbass he is on my bus I told him off once but he just called me a bitch

Just ignore him and don't react or he will think he can keep on doing it. If he makes physical contact with any one then tell a adult

that call you guys that out of their own insecurities. people put other down to make themselves feel better. just ignore, if you react it'll make him think that he’s hurting you guys and he’ll keep on doing it.