I agree it looks bad. IMHO, by not addressing it you let him know he can get away with it and he took advantage of that. It doesn't have to be confrontational - a simple, quiet but firm "Coach, you need to let us do the officiating." or something similar. Technically (pun intended
), it's a violation of 10-4-1-b, so you can and probably should T the coach if he doesn't heed the warning.
Coaches need to coach and let the officials officiate. Sending the message early will eliminate a lot of this crap.