I don't have a technical in this situation. There are coaches around these parts who do the same, they'll stare at the officials while berating their team in the huddle. My high school coach did the same, and he never got a T for it. It's a thick skin thing; if it isn't verbally directed at me, my partner, or someone from the other team, I'm going to ignore it and do a redirect like the partner in the OP did if possible.