TO wasn't a good coach because of her demeanor...he was a good coach because he was good at coaching.
I have worked with yellers, screamers, laughers, butthurters, complainers, positive, negative, you name it. The only thing I have ever noticed is that good coaches coach well...most will tell you that the best teachers make the best coaches.
Some of the most annoying coaches I have coached with were great at coaching. Some of the nicest coaches I ever had were horrible.
The worst are the ones that cry to the officials all game. I usually just walk away from them while the game is going on.