Bullying is mean.
Tom finds out a classmate of his stole a pencil from him without asking.
Tom wants to teach his classmate a lesson for stealing.
Tom tells his classmate to stop stealing, using examples, without being mean.
Tom comes up with mean nicknames for his classmate and taunts him the rest of the schoolyear.
Tom's classmate thanks Tom for the lesson, and they get along the rest of the year.
Tom gets sent to the principle multiple times, and Tom's classmate feels humiliated.