I used to be a teacher.  I witnessed lots of bullying. Lots of teachers were bullies to each other, many parents were bullies. If bullying was witnessed between students, it was often dealt with dismissively eg “you’re both being juvenile”,”go away and work it out between the two of you” etc. Bullies soon learn if they’ll easily get away with it. Is no different in adult circles in the workplace or between students in school. Bullies are everywhere and will only get worse, the longer people dismiss it.