The only effective way to deal with bullies is to sock 'em and show them who's boss.
I'm perfectly serious, laws against fighting in school are killing kids' ability to defend and stick up for themselves.
Teachers have their own fear of a fight erupting in their classroom, a fight demonstrating their loss of control of the classroom and hence incompetence.
Dude, he didn't say start the brawl in class. In my day (spoken like an old), it was handled at the bus stop or after school, and for real youngs, the playground. In today's world you'd be expelled for it.....but back then it was standard fare.