Questioning Teachers

I think the teacher that wrote a letter to the parent's of a student who kept arguing and questioning the teacher's lessons is very old fashioned. It definitely reflects the teacher's skills and how little she cares for the student. If I were that student's parent, I would be outraged that a teacher gave my child detention for simply being curious and wanting to learn. Most teachers I've had love discussions where students ask questions. It helps the student develop deeper thinking skills and allows them to work through a problem if they're wrong which I think helps them remember what they're taught much better than just absorbing information like a sponge. Keeping student's from having an opportunity to question why things are the way they are doesn't allow their minds to expand and grow. How can they learn to have a mature discussion with someone they don't agree with if they're not taught how to handle situations like that in the right way?