I'm really sorry you are dealing with this. At my last job our team leader was an absolute disaster. She was very negative, had poor communication skills and, honestly, did not seem to like most of us on the team. She always criticized the sales department when, without them, we wouldn't have work. It created such a toxic and stressful environment. People were constantly leaving or being let go because of her. In the end, it would have probably been cheaper to get rid of her than to deal with the constant revolving door of employees.