I was bullied, a lot. The only thing that really stops a bully is shaming them, treat them like they are a child that needs to be treated as younger than their age. Bullies are demanding and demonstrating dominance, and if that is turned around on them, the bullying stops.

"Bad" is a cool label, it marks you as dangerous. But the comment proposes "immature", "behind". So give then a neat, pink shirt, not a black one with a skull on it (not saying that this works either, just clarifying).

Right?

There are lots of reasons this stuff happens, but one of them is definitely that some kids aren't acting out for school reasons but for attention from their parents.