Fighting back worked a hell of a lot better than anything the "responsible" adults could ever suggest. School teachers, councilors, my mother, etc, all gave useless advice. My dad told me to fight back. When I finally listened to him, that's when the bullying stopped. I lost that fight, but won the war so to speak.

Telling kids not to fight back is a terrible cowardly thing to do, the adults who do that are either oblivious idealists or are just cynically covering their own ass because they don't want to get in trouble for encouraging a confrontation.