I was about to say teach your child self-defense and how to fight, and the last sentence of that same paragraph just proved my point.
Look, as a parent, your goal should not be to teach your child how to avoid bullying. That's not within your control, nor your child, and in the real world, even once your child is grown up, there's always some moron out there in the world who's going to bully you or want to beat you up, sometimes for no reason, sometimes for not being like them. That's not an excuse to teach your child to be like other children just for the sake of conformity because that is the wrong thing to teach. You teach them how to fight back when people beat them up for being the way that they are. None of your other points matter against that.