Remember the first time you went to a show and saw your favorite band. You wore their shirt and sang every word. You didn't know anything about scene politics haircuts or what was cool. All you knew was that this music made you feel different from anyone you shared a locker with. Someone finally understood you. This is what music is about.
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.