Report the bully to a teacher or headmaster, so the school will call his or her parents to settle it properly. The student should also call the police in case of injured.
Personally, the student should build good networks within school and be friendly to everyone. It is also the shcool's responsibility to educate the students about the consequence of such behavior.
Smart people talk less. Don't let the rude people ruin your day. I would just ignore and keep distance with the rude colleague. There are always nice people to get along with; they will often make your day.
希望能帮到楼楼。