Rage-quit happens sometimes here too, though I never send any abuse to anyone when it does, as I'm too busy shutting off the PS3.
Takes a lot to make me rage-quit though, I can only remember two times, one was because of so much lag that I fell through the track, and the other was that I lost an epic race because I crashed into a ship that was stopped and wasn't ghosted (Though on that occasion I finished the race then quit).