Do not complain about your privilege. As in, “I am busy”, “I have to deal with too much politics”, “I worked over the weekend”, and so on.
Do not bitch about peers and subordinates. As in, “This person is driving me mad”, “That guy is never doing their job”, “I never wanted to work with them”, and so on.
Do not undermine a plan that is not your favourite one. As in, “That was not my idea”, “We are going to do this instead”, “We will do it, but..”, and so on.
Simple things that every manager should be aware of.