People should do what I do, don't hold a grudge. If you are hell bent on hating someone every time you log into the game then you are doing it wrong. Allow me to simplify...
*Ahem*
IT'S A GAME
If you are taking it that seriously then someone needs to unplug your computer for a few months. I'm not saying don't get mad, by all means get mad for watermelon that goes down in game, I do it all the time. If you get mad at someone because of something they did or said to you, then find somewhere else to go fly. Squelch them and move on.
I should also say that I have crossed the line out of anger before. I will usually be the first to apologize after my head has cooled off in game. If I have to log out then I will be sure to send them a PM on the forum (assuming I know their name).