I think there is a time and place for a "cut to the chase" comment like "you coach, we ref." I think I've said that one time this year and I didn't regret it.
If a coach is respectful to me, he'll get courteous service.
If a coach is constantly whining about "missed calls" for the first two minutes of the game (traveling, 3-in-the-key, the typical ignorance), the "you coach, we ref" comment might be what he needs. More likely I'll say, "is there a question in there coach?," but sometimes the "parental voice" is necessary.
Z