Dear Every Teacher and Professor Everywhere,
You lied to us.
There are stupid questions. And when you say "There are no stupid questions", you are lying.
Now, there is some truth to that statement. The act of asking a question, the impulse to seek more information or get a better explanation of the information you have, that is never stupid. But there are plenty of idiotic questions. You know it and we know it, so how about we all just acknowledge it.
Every Exasperated Student Ever