Public schools teach you all the wrong ways to deal with bullies, and forbid the correct ways. They teach kids to run to teachers for help whenever they get bullied; in the real world that doesn't work because there's no teacher to run to. And when a kid stands up to a bully themselves, the school punishes him for exercising precisely the skills he'll need later in life. Schools don't teach kids how to deal with bullies, they teach kids how to be docile victims.