For me, size of talent is only one facet. The point is that these legends, divas, what have you, don't HAVE to be azzholes, that just makes them nothing in my book. Thankfully, there are plenty of huge talents out there who are truly decent people.
In bands I've had I wouldn't tolerate any jerks and, by the same token, had I been a jerk, I wouldn't have expected to have been tolerated. Maybe the mutual respect we had for each other as people, in addition to the musical talent, was what kept us together all those years.