I'm going to call my teacher dumb
Why would you say that to your teacher?
He gave me a stupid and unfair feedback on my paper
He gave me a stupid and unfair feedback on my paper

I'm sure your teacher is only giving you the feedback you need in order to do better next time. Teachers are interested in cultivating success in their students, which is why you should respect them! I think you should take the feedback seriously and learn from it, instead of calling him dumb.
What? I don't have to listen to you lecturing me all the time, this is just ridiculous.
My intent wasn't to lecture you. I just want to help you get along better with your teacher, and try to improve how well you do in school by taking your teacher's feedback seriously.