What do you think of me telling my son to jump another kid?
Oh my god, why would you tell your son to attack another child?
The other kids are mean to him and attack him.
Telling your child to fight another child can exacerbate the situation. It should be brought up with the parents of those children, or the school principal.
I'm going to do it, he needs to learn to defend himself.
But the children could get hurt. You really need to handle this differently instead of encouraging your kid to hit another kid. Is he going to have to fight the world?