I tell kids who are bullied something a little different. You have to understand the basic laws of the thing. Then it becomes a lot easier to deal with it.
You will never stop bullying by "passing laws", and handing our brochures about how to be nice. But you can efficiently stop it by understanding its laws and dynamics. The other animals never bully someone just because they are different. They bully because that someone is different AND harmless.
Kids can learn how to stop looking & being harmess with perfect ease, once the initial taboo is crossed over. They can learn how to be wild. They can learn how to cause pain efficiently, and remorselessly.
And it doesn't always come down to physical fighting or physical might. That is scarcely enough, I want that bullied kid to be able not just to fight back, but to strategize longterm ways to actively destroy the bully's spirit until there isn't anything left, but a blob of instinctively quivering protoplasm. Make them so afraid they piss themselves looking in your eyes when you get in their face. Make them run across the hall and hide whenever they see your deaf, unassuming figure going up the stairs. Then that cheery disposition and friendly demeanor you have with everyone else gains a whole new weight and meaning. You may be different, but you are far from harmless.
In the old days, the samurai warrior caste of Japan understood this simple universal science well, and I learned of it from a traditional martial arts instructor, because I got lucky. Kids growing up with "normal" parents who think they should be nice and cute and harmless all of the time are quite frankly at a disadvantage in the real world, of which the schoolyard with its bullies is but a toned-down microcosm. The more they believe their parents' delusional dictums instead of fluidly adapting to real world circumstances, the more bullied they will be. This is normal, this is nature doing nature's work. After all, we are not gods: we humans must face our humbling predicament. We don't get to determine our environment or other people in it to our liking. Sure we can ignore reality if we want, but we can't ignore the consequences of ignoring that reality.
It's unfortunate that many well-meaning parents are screwing up their beloved child, by bringing them up to be a weakling. This is based mainly on wishful thinking about how they want them to be "nice people", instead of teaching that kid the reality they're about to experience as it is, stink, dirt under the fingernail and all. That is at bottom a kind of meta-betrayal, one that the kid cannot consciously comprehend because of how enormous it is, and it hurts the kids very much.
Oh your kid is going to be a great Samurai :) I wish all parents had time to teach their kids about them. I chose to be nice, to be politically correct, I chose to be emphathetic. Bullies and "their victim" they both need help. I don't want bullies to fear me or anybody else, I need them to let go of their anger. Remember: before anger, there was pain and before pain, there was sadness. If I told you the stories of my my bullies, you could understand. But I am in no position to talk about other people's private life. Fear is not the solution, unity is the real solution. People need people, even bullies. That's my opinion, but each to their own :) (and I am not trying to excuse bullies, don't misunderstand me)