Team members and coaches who constantly criticize a poor shot or ball selection do absolutely nothing to improve the teams chance of winning. Top players are strong because of confidence. It is no different for weaker players. No one wants to lose or miss a shot. So missing is not stupid.
Criticism is stupid, and reflects more on the critic than the player.
When asked to coach, and the player wants advice, I first ask what they would do. If you use top english with a medium stroke, you can avoid a scratch in the side pocket. You'll have another shot. My assumption as a coach is that the player selected the shot he or she feels most comfortable with. I whisper my advice because I don't want the player to believe everyone is second guessing them.