Must be some part of NO that he does not understand. Some feel that if they disagree with a decision that they are somehow owed the opportunity for a "discussion"; which is a passive aggressive way of saying that they do not respect the decision. Were it not for the fact that he is the HS coach and just another TB coach I seriously doubt that a "discussion" would even be a consideration.
Yes, this is true! Being the HS coach puts him in a position of power that makes this situation very difficult for DD. Last summer when a girl left my team mid-season, I didn't demand any last meeting with her. It was simply her parents meeting me (at their request) after one of my practices. We had a cordial chat, then parted ways.
I am documenting this situation (I think you suggested it).