It's happened to all parents at one point or another, whether it be a negative written comment on an assignment, or a phone call or a conversation during PTA time. She'll say something that will hurt your feelings and that protective instinct kicks in and all you want to do is set the teacher straight. To me a complaint from the teacher is very stressful, and to complain about a teacher very difficult. It took me years to get a grip on how to handle the situation in a way that would actually help the child.
