How little praise warms out of a man the good that is in him, as the sneer of contempt which he feels is unjust chill the ardor to excel.
Screaming at children over their grades, especially to the point of the child's tears, is child abuse, pure and simple. It's not funny and it's not good parenting. It is a crushing, scarring, disastrous experience for the child. It isn't the least bit funny.