I had a game like yours a few weeks ago, except the coach wouldn't leave so we did. Wahooo! Lucky me!
Anyway, as usual Mick has some good advice. Smile every now & then if you don't want to appear too "arrogant" (whatever that means). Chuck hits on a good point as well: your obvious professionalism is kinda foreign to these folks, so they process it as "arrogance".
Do you get these kinds of comments when working your "real" games? I kinda doubt it.