I wouldn't say "hate" is appropriate, but I don't like when employees bad-mouth the company or our clients. I had one coworker who loved gossiping about how "stupid" someone was. I told her I thought it was a bad idea to do that, it made me uncomfortable, and I shut her down whenever she started to bring this up.. I thought it was unprofessional, harmful, and I figured if she's talks trash about people to me, she likely talks trash about ME to others.