Mine is definitely the Rockets (when they are semi relevant) and for stuff such as this. In general, their fans are the worst - in a game they clearly benefited from some dodgy calls (particularly from female ref), some dude manages to manipulate a video and all the npcs on that sub buy into it.
A close second right now is the Suns.
Lakers. Easy. I lived there for 9 years, then lived in other western areas where more lakers fans were inevitable, and their fans are the most delusional and entitled I’ve come across, super annoying. After we swept them and won game 4 by 30 points some of their fans still vehemently insisted they were the better team lol.