A Jerkass is a character who is so completely obnoxious that it is unbelievable anyone would willingly interact with him; let's face it, this character is schadenfreude incarnate. There can be numerous types of Jerkasses - some are polite, intelligent, charming, handsome and/or brave, but still give off a basic air of arrogant, snobby, sneering, leering prickery that makes them such a nasty little punk that you wonder why nobody's shanked them or busted a cap in their skull yet. Others are more obvious assholes who may be racist, stupid, or just basically unpleasant. Either way, it's usually their status on the team of "good guy" that results in them never being called out on it. After all, if they were an asshole on team "bad guy", they'd just be a villain.