Varsity Coach on JV bench

[Rookie]

I'm sure this has been discussed before. How do you deal with a Varsity Coach who wanders on and off the bench of his JV team, who did not stop griping to me the whole time? Is he considered an Asst Coach?

I know this is wrong, but I played the politics game. I badly want to move up to varsity, and I wasn't about to give him a T for just griping at me. He never crossed the line in anything he said.