Via Christine Porath in the New York Times:

Bosses produce demoralized employees through a string of actions: walking away from a conversation because they lose interest; answering calls in the middle of meetings without leaving the room; openly mocking people by pointing out their flaws or personality quirks in front of others; reminding their subordinates of their “role” in the organization and “title”; taking credit for wins, but pointing the finger at others when problems arise. Employees who are harmed by this behavior, instead of sharing ideas or asking for help, hold back.