I would like the answer to that. I dealt with it for years when I was in school. (I graduated HS in 1977.) even then the teachers couldn't be everywhere all the time. I was a little guy, much smaller than most of my classmates. So I learned at an early age that “if you stand your ground but can't hold it your face will get rubbed in it.” So for years I ran. Bullies had a field day with me. I had few friends.
Then one day it all changed. I don't remember a lot of what happened, but I had had enough. I lost it. I picked something up and started wailing on the bigger kid who hit me. Other kids said I just went crazy.
Got a week's suspension from school, but when I got back, it was like, “Leave Fred alone, he's crazy.” And I had no more trouble.
The teachers don’t have to be everywhere all the time. It takes a good parent to drag the bad parent to the police station or the principal’s office enough times to get it to quit.
I had my son’s bullies ringing my doorbell at night. I purposely answered the door every single time. I finally saw one of the kids in my bushes. I told the parents the next time I see anyone in my bushes at night I would treat the shadow as an armed burglar. That stopped the kids from my property.
You’re correct. Act crazier than the bullies and they leave you alone.