In the wide world, if someone is bullying type, you ignore them, move away from them. But in the school, there is no where to escape.

Further, if you retaliate against a bully, you are seen as the problem and punished.

The "tell a teacher" is even worse, as it never solves the problem, it just makes it worse. You know, that dreaded walk home. Or the bathroom. Or the lunch hall.

And none of this addresses the real issues of bully-victim dynamics.
Everyone talks about helping the victim... by giving them the opposite of good advice. And no one wants to work with the bully, although they really need help.