I had to report to a supervisor about a charge nurse's unprofessional conduct. Nothing salacious, but definitely not OK. Manager initially asked me about a scrub (with a mean streak), and I had to say, no, not the problem. I don't like to work with him, but he is who he is, and I have nothing specific and measurable to report about his behaviour, so I have no official issue with him. I will not gossip, I will not tattle. I will report conduct that breaches acceptable behaviour of a supervisor.
Some people should not ever be in charge, and I know because I am one of them. But then, I don't allow myself to be put in that position.