What kind of personal belief could a leader have that would cause you to lose respect / confidence in their capability as a leader?

The one single biggest disqualifier in a leader for me is unfortunately the most common - the belief that they are better than everyone else. The smartest guy in the room.
Not talking about self-confidence, or tempered expertise. I'm talking about the guy that we've all met, and I daresay is present somewhere in every battalion and brigade-levels' top six. The doctrinaire who has to try and belittle everyone with their encyclopedic knowledge of MILPERs that are 24 hours old and the latest, greatest FM. The guy who repeatedly chants the mantra of how he "did it in Iraq". The guy who has to tear down those around them to make themselves look good. The guy who presents a zero defect mentality, but can't be bothered to develop subordinates. The guy who micromanages every detail, because no one can do it as good as they can. The guy who pounds on the staff to build an elaborate plan in a short time, then proceeds to shoot holes in it or make changes to make it their plan in the end.
Man. I hate that guy.

The entitlement syndrome and that subordinates were there to serve them. Too often, WAY TOO OFTEN, senior personnel seem to develop this sense of entitlement and they got the whole thing bass ackwards, they are in the position to do the exact opposite, to serve their subordinates!

I think too much religion can do that for me. The military is a professional organization in which we are supposed to have high morals. I do not feel it is a place to discuss personal religion openly because it can lead to a hostile work environment. It should stay what it is, a personal belief. I have seen leaders bring their religious beliefs to work and it affect their ability to objective look at situations because that leader "felt" a certain situation offended their beliefs. I am trying to be vague on purpose because I do not even like discussing it.