> how could they trust me as a member of their team? I might turn on them next.

This is also why you shouldn't gossip negatively about anyone, and you shouldn't make jokes about employee termination. People will view you as a threat. The threat perception will become dislike and they won't even know why they dislike you, they just do. Then they will hallucinate that you're a hopeless poor performer whatever your performance actually is, because they've already emotionally decided that you're awful.