What are the biggest mistakes parents make in dealing with other adults, such as teachers and coaches?

Parents should not act like everything is a life-and-death problem-from a bad grade to not playing on the team to not getting a part in the play. If somebody is going to die in the next five minutes, then you move. If not, then you sit down and you figure out what you are going to do.

Teachers often feel like parents do not respect their professionalism. That makes them feel mad and unsafe. They do not like parents who threaten them with a lawsuit, who fight the fights for their kid, or who thing that whatever has happened to their child trumps everything else.