Equivalent Dickschange
The act of one person being a dick to another person after having been first treated in a dickish manner that they did not deserve to be treated in.
I was hanging out with my friend the other day, and all of a sudden he began acting like a major dickbag towards me. He persisted, despite me trying to ignore his behavior so I was forced to start making short jokes. His feelings got hurt, but I don't feel bad because I was merely demonstrating the art of equivalent dickschange.