The bully always wins. Always. There's no stopping him. If you fight back, the results from whatever authority figures are around you are worse than if you just let him pick on you. Teachers, parents, cops, or whoever will always put you at fault for the bullying and will always threaten and humiliate you for trying to stop it.
So don't fight back. NEVER fight back. Parents, stop giving your kids stupid advice to stand up to bullying. Instead, teach them how to cope. Friends, stop telling your friends to quit taking it. Be there for them instead.
Accept it; the bully always wins, and always will. Nothing will ever change that. It's better to do nothing and have the snot beaten out of you than to fight back, because the consequences of fighting back are *ALWAYS* worse. Learn to lie there and take it like a man. There are no alternatives.