Bully is a documentary that not only follows bullying victims; it gives us a look at their whole environment -- parents, other kids, teachers and communities. We see there's no single cause of it, and that it can't be solved one kid at a time.
No one other than parents should be telling children what words they can hear. It is more important for children to learn the harm and dangers of bullying than be shielded from the language used in carrying out that bullying.