And I still see this in college

I honestly never had this happen.

Usually when I hear this complaint its in a class that had like 3 prereqs and the professor isn't complaining about not knowing their subject already, but for having no idea on all the basics that they should have learned in those 3 prereqs. Ex: taking an advanced calculus class and then having no idea how to do basic algebra.

This is so annoying! I also hate the sense of entitlement teachers have. I mean, I understand that we are here to learn and we do have to respect teachers, but if I simply don't hear you from across the corridor shouting and throwing insults at me isn't necessary.