Man, Utah fans have been the unarguable worst in the league for a few years now
I'd have to put the Laker and Heat fans as worse than them. can't respect a fanbase that can only support frontrunners and if they're not losing the game.
as for being the biggest jerks, I'd have to go with Sixers fans followed by Knicks fans. pretty verbally abusive (to everyone). at least Boston fans only abuse the opposition.