Which characteristics of a leader do you dislike?

Top of my list is bullying! Someone who takes advantage of their position in the institution to make other members of staff feel uncomfortable, inadequate and unappreciated. They play on the fact that as they are higher up the food chain, they can make your life difficult / cost you your job if you don't comply. A really nasty trait.
Less offensive, but still quite irritating, is working for someone who is disorganised. This means you are constantly under (probably unnecessary) pressure because their lack of organisation means you are always running late to hit a deadline. And then the time factor becomes your problem! A lack of empathy and the inability to listen. Both of these are important, in my view, if you are to manage people and endeavour to manage them well. You never know, the office junior might just come up with the "next big thing" but, if you are not willing to listen - you will never know. And lastly, hypocrisy. A leader who is unpunctual, keeps people waiting and is sometimes rude and then has the temerity to criticise their staff for the same behaviour.