How do you handle people for mistreating you?

It depends on the context.

If it is a coworker and they are doing something that would be considered harassment or bullying, report.

If you are a minor and it is a caregiver and they are doing abusive things to you, seek outside help from a teacher, school counselor, priest, pastor, friend’s parent etc.

If it is a friend, cut them out of your life.