You don't have to react emotionally to everything.
Matt Goes to school with Robin who is intellectually disabled and in the special ed class.
Matt wants to impress other people and be popular.
Matt sticks up for Robin when others make fun of her and treats her respectfully.
Matt mocks Robin and plays mean pranks on her in order to make others laugh.
Robin is a sister to one of the popular kids who gain respect for Matt and befriend him.
Robin is the sister of a popular girl who had a crush on him but now dislikes him and tells her friends what Matt has done to Robin.