This just sounds like the same as the nice guy paradox. If girls are looking to date guys who are both nice and good-looking, you only date guys who are assholes if they are really good looking.

Same thing with a "rockstar" asshole engineeer. If you weren't an awesome engineer on top of being an asshole, you wouldn't even be employed and we're not talking about you.

It's not because there's this magical correlation between being a "rockstar" and an asshole. This is just an outcome of sampling.