You're right but I don't like these kind of teachers who make fun of you when you don't understand something or ask a "stupid" question because it's just making the person who asked the question shy and he won't ask any question because he is kinda scared. I know a lot of persons like that and because of that they don't ask any question if they don't understand. The best kind of teacher is not super strict and not super cool they know how to make us interested and sometimes we just talk about random stuff to chill a bit, but he need to be strict sometimes too so we remember that we're here to study and build our future.