I'm a total sucker for that trait. Terrible of me, I know. It's the most prominent personality element of my favorite fictional man, Rodney McKay.
I know, I'm the same way. I suppose a person with too much
self-esteem is easier for me to tolerate than a person with no self-esteem at all. I've known a few people like that, and they're like... human versions of Eeyore.
And I love Rodney, too. What is it about snarky, arrogant doctors?