Why is it o.k. to treat educators like they are nothing?

It seems like teachers at all levels go through schooling for many years, but have absolutly no brains. Why is that. Yes I am a teacher and have two Masters, and am tired of parents talking to me like I have no idea of what is going on in the world. It makes me wonder what will happen with future generations if we keep allowing these type of parents to rule. I am a parent and I do know that there are times when my child is wrong. Do I take her word over the educators. Well I don’t that was not the way I was raised. So why is it o.k. for parents to talk to teachers the way they do?