I never knew abusive spitting was for alcoholic bums only! ROTFL!
But put yourself in QTs place, ever since he became known, hes had people taking shots at him in public and in private (which we dont see). He might have had enough of all the BS and thats how he reacted. He also bitchslapped Don Murphy (the fucker deserved it) that time too. I think QT learned his lesson from all those things though. Its not like he spits at everyone all the time. Cmon give him a fuckin break.