When kids are unhappy about something that happens in school and they believe that the teacher was the culprit, they'll usually go home and complain to mom or dad. If the parents are weak and are in a position of being intimidated by their own children, they'll usually go to school and argue for their child. Why? Because they can win the argument with the school, but they'll always lose the argument with their own kid. I experienced this once a child bullying his mother in my office