Far more people (alas) orgasm from inflicting pain on others than from pulling knives from their backs. I've heard lots of JonMon stories and don't doubt in the least that he is as loathsome as people say he is (on the few occasions I met him many years ago, he struck me as disagreeable). I don't in the least advocate accepting his behavior. Nor should treating him with some decency be equated with doing exactly what he wants. On the contrary, it should be made abundantly plain to him that he has a lot to answer for. And if he has hurt you, by all means steer clear of him. Just don't go out of your way to hurt him (or anyone else, no matter how deserving). You only add his pain to your pain and so increase the pain in the world. As Gandhi put it, "an eye for an eye will make the whole world blind."