Arrogance is a bug
Somewhere along the way, we confused the signals with the work. Now there are people who start with the bad behavior and the affectations, hoping that it will be seen as a sign of insight and talent. And they often get away with it. "Who's that?" we wonder... "I don't know, but they must be good at what they do, because why else would we put up with them?" It's a great plan when it works, but I don't think it's a strategy to be counted on.
The key to getting a reputation for being brilliant is actually being brilliant, not just acting like you are. Seth Godin