This is only half-true. Normally, the bully can escalate further than you are capable of, since they are experienced at it. Sometimes they can even get their henchmen to hold you at a distance so your resistance has no effect.

It worked for me once. I think, bullying the loser was kind of cool in front of his gang, but rolling around on the floor wrestling with a loser in front of them was not so cool. Sure, I got pulverized but he didn't try me again.

That is an anecdote though, not data. He was a small time bully, could have simply escalated to a stabbing after school and left me permanently disabled. I don't know the real answer, but telling people is a good start. Make sure people know about every incident. Don't silently suffer.

I don't fully disagree, but the bullying will not stop if they see that they can beat you up easily. It might even get worse.