Eve all I can say about some one pulling a dirty trick like that is:
This game/site is like a garden, and like any good garden you have to work hard to cultivate your game and put in the time it takes to pull a few weeds out of the garden so to speak, I keep a note book and write down the names of unpleasant characters and don't play them anymore. This may or may not work for you but you should find some way to get the full enjoyment out of this wonderful game. That being said.How difficult would it be to put a algorithm (or whatever you call it) that when a quit that results in a tie after the 2 quit pts/ end are added on, the quitter gets the loss ?? You aren't the 1st person that has asked this over the years.