As a general rule in life, it would be good to take the in-between step of talking to someone who can make that person stop before escalating to violence.

That being said, I’ve gone through high school and I know teachers may well not do anything to stop it.

In my experience staff or students stood up for me, and people only stopped fucking with me after I hurt someone badly enough. Since there was a clear paperwork trail of me complaining about that individual’s actions, I didn’t get any real punishment since it was clear the people responsible for stopping the escalation had failed in their duties.