I can give you whatever rating I feel like and I don’t have to explain myself.
This was the feedback that I got from my boss when he rated me. He said that he didn't have to provide any details and proceeded with a very vague commentary regarding people are saying this and that. So I'm giving you a pass rating. I was positive and did not react the negativity of his feedback but I added that it is difficult to improve my performance if I don't know what I've done that is not optimal. He got upset and reiterated what he said.