"Bite aversion" is why you have to leave puppies together for a while after they're born. When the puppies are really little, they bite a lot. If you take one away at this point, without a lot of training, he'll grow up to be a bitey dog. They need to learn that biting hurts, and biting someone else is likely to get you bitten back.
Junior high kids, same thing. This is the period when humans develop enough of a social sense to become truly, deeply, terrible; but often don't have the empathy to refrain from deploying it.
In 7th grade, there was a black girl who picked on me. Way bigger than me, physically an adult woman. I didn't know her; we didn't ride the same bus, but we waited in the same area. She heckled me with an abusive mix of aggresive flirtation and friendliness followed by hostile sarcasm. Abundantly clear how much she relished my humiliation.
I knew even then that she had it worse than me. She was heavy, wearing inexpensive clothing, missing an adult tooth. I knew why she needed to take it out on someone else. But I also knew how not to get bullied, and that was not to give them the satisfaction. So I just took her abuse stone-faced until she moved on to easier targets.
I forgive her. I forgive everyone who's ever done anything wrong, because it's all part of who I am today, and I love who I am, flaws and all.
Forgiveness doesn't mean weakness. Dogs who've passed through bite aversion aren't going to put up with being bitten. They just don't take it further.
Forgiveness means not taking it personally.