When a cat approaches a human and head butts the human, it’s a form of affection. It’s a way for the cat to tell the human how they feel. It is just one of the many things a cat will do to a human to tell the human the cat loves them. It’s not a form of abuse. Cats tend to play rough each other and their favorite humans. Cats tend to treat their favorite humans as honorary cats. That’s why cats give their favorite humans head butts.