I think Rocky's approach might be the best one. In my younger days, I would have T'd him up quick, but now I would probably tolerate a little more. If he was staring at me I might be the one to approach him during the timeout. If I was feeling playful, I might have moved to the other end of the court just to see if he would turn his body so his stare would follow me. I would love for something like this to happen at the beginning of a game. In that case, virtually all communication with that coach is over. Approachability is a two-way street and the stare is not appropriate for good communication. I looked that up.
