Good for you, Snap. My experience is, the nicer you are to people who've been not too nice to you, the more uncomfortable THEY get. And you end up with the secondary gain of enjoying their discomfort--pretty fun, actually.
"My predominant feeling is one of gratitude. I have loved and been loved;I have been given much and I have given something in return...Above all, I have been a sentient being, a thinking animal, on this beautiful planet, and that in itself has been an enormous privilege and an adventure." O. Sacks