I have seen from my experience in the industry that a leader that lacks empathy is the worse. People work not only for $$$, but also for respect and relationship.
No mentorship
Some bosses just keep working on “his/her” things without spending time on developing the skills of his/her employees. S/he fails to understand that s/he is as good as his/her team. Without any direction or mentorship, the team becomes dysfunctional within a short time.
Unbalanced feedback
Some bosses doesn’t provide feedback at all. Some bosses provide feedback too much. Some bosses only provide negative feedback. All of these are bad. There should be a balance on the feedback. Nobody likes to be judged all the time or hear only negative things.