On a few occasions lately I have seen some poor examples of flight crew leadership -- mostly stemming from an attitude of indifference and selfishness. The snowball effect of these attitudes in this industry is real, and I am sad to say I witnessed many people (crew and pax alike) greatly inconvenienced by it. One small action can cascade into a multi-day disruption quite easily, when things are running on thin ice due to weather or other irregular ops issues.
Thankfully, those with this sort of attitude are, I think, still in the minority. Regardless of which industry you work in, airlines or not, these attitudes are hazardous for the well-being of everyone around. Before the airlines I worked in a very different line of work, and while it was very rare in that field, there were still a few bad apples. Invariably they either quit or were shown the door, but in that line of work, with projects that lasted many months it was not an overnight process. I learned form that experience, both in a contributor and leadership role, that when you have someone on your team who is completely indifferent, consistently negative, and selfish, the net effect of their presence in the team was negative. That is to say, you'd get more done without them.