Somehow I am reminded today of a problem that a coworker had years ago. Her daughter, a middle-schooler and a big girl, rode the bus to school every day. There was a first-grade boy who singled her out for attention: punches, pinches, that kind of thing. She could NOT make him stop. The bus driver would do nothing. The school personnel would do nothing despite her visible bruises - they went to different schools, of course. My coworker got involved but could get no action. The school people could not believe that her daughter had a valid complaint. "She's so much bigger than he is," was all they would say as they brushed all that off.
So she told her daughter that the next time the boy punched or pinched her, she should haul off and slap him. She did. And was banned from riding the bus anymore, forever. The boy still rode it, of course.