If you're incredibly talented and have enormous success for most of your life then you probably have gotten away with being an asshole time and time again. What are you going to do, fire Michael Jordan because he's mean? You're going to kick Ellen off your TV channel because she's rude to her people? Over time they get reinforcement that being an asshole is acceptable for them. And it's so convenient to be a jerk.
Later on when someone asks about it, well, that was my secret to success of course. You have to be an asshole to get ahead. To heck with that!
Successful people being assholes is a sign of their weakness, not their strength.