>>212348760Tony in the later seasons is repeatedly shown to capriciously turn on people for reasons even he sometimes can't fully understand. He turns on Hesh and tries to intimidate him for lending him money, which was a favour. He spitefully makes Bobby kill someone just to hurt Bobby for beating him in a fight. He nearly kills Gloria, and although she was doing things more enraging than Melfi ever would, the point is it wasn't a decision, he was just in a rage he couldn't control. He assaults his politician friend in an out of control rage for something he explicitly gave him permission to do. He repeatedly almost kills the bartender at the Bing just for being annoying. He still almost permanently turns on Melfi for not reciporacating his attraction-now add this level of entitlement to that situation.
Tony is malignant, spiteful, violent and unpredictable-that's not to say he acts erratic all the time, one of his actually useful qualities is having a better ability to think and emotionally regulate himself than other mobsters most of the time. But that only serves to put people more at ease for when he lapses and reveals he's fundamentally a savage hateful animal welded to an introspective, depressive, surprisingly smart outer brain that doesn't even really want to win the battle.