During my time coaching at the HS Frosh level, I always wondered why some officials seemed to be so concerned about what I was saying or doing to people other than them during a game, especially during a live ball. I was T'd once for saying "d*mmit" to a player on my bench, with my back turned away from the court, while the other team was in the process of making a lay-up.
I was T'd once for flipping my clipboard over my shoulder, with no verbal comment, where there wasn't even a remotely possible officiating-related reason for doing it, after my player did exactly the opposite of what he was instructed for the 63rd time that game. We had an empty bench area, and the clipboard landed in a pile of player bags never made a sound, but I got T'd, during a fast break by the opposition (boy was my counterpart ticked when they stopped that to T me, and then the kid missed his FT's!
)
I've even saw during a JC game where I do PA announcing last year, a ref stop to badger a coach who dropped an F-bomb on his adult players, but only loud enough to be heard within 5 feet. The ref started an argument with the coach while the ball was in play, at a JC game!
It seems to me that at HS and above, unless it's blatantly unsportmanlike, or directly addressed at an official, or causes a safety hazard, there shouldn't be a lot of mind paid to things like flipped clipboards and the like. If a coach is making as *** of him/herself, let their Administrator deal with it, especially while the ball is in play. My .02.