So there was a leader of another department who was notoriously uncooperative, lying publicly humiliating, threatening… my boss enabled him. I had to work with this guy, but he hated me for being honest with data, because it made him look bad. So he would refuse to cooperate and would make a scene.
One time this guy yelled at me for 15min straight in a meeting. After allowing me 3min to explain my position, he agreed with what I was saying afterall. I brought it up with my boss and she blamed me for the rant.
Tip of the iceberg.
Today I resigned. I informed her the reason I was leaving was a) unprofessional behavior, and b) her enablement of this unprofessional behavior.
There was defensiveness.
Meanwhile, colleagues from across departments acknowledged the situation and the issue with the current status quo. I've helped to prepare the company for a greater future.