I have never heard of anything so stupid, so asinine, so—well, you pick a synonym. That was completely uncalled for, and if that coach had in mind discouraging this pitcher he couldn’t have done a better job. What I would have done in that situation would be to shove the ball back into that coach’s hand and say to him “You think you can do a better job? Go get a glove and get out there on the mound and pitch and see how you do!” And I would walk off the mound and out of the ballpark and say the heck with it, I don’t need this.
Fortunately, I never had that problem. The team I played for—it might have been called semipro if everyone had gotten paid—had a manager with good baseball savvy; he had been a semipro infielder, and we went by major league rules all the way. And I was also very fortunate to have a pitching coach who was an active major league pitcher and who firmly believed in giving a pitcher all the encouragement, support and reinforcement of which he was capable.
That coach who shot his big mouth off needs to be raked over the coals but good and then summarily dismissed, fired, kicked out on his kiester. Nobody needs or wants someone like that. :x