This hits home. I was severely bullied and ostracized at school.
It was only when I snapped and kicked a bully that the bullying stopped and simply became avoidance. There's a point to be made about setting personal boundaries "Don't do onto others what you wouldn't want done to you".
I don't think it's about restoring self-esteem or pride but simply setting personal boundaries in a situation where "turning the other cheek" wouldn't help.