Oh man.
I completely went off on a prof for this when I was an undergrad.
The setting: Biology 101 - big lecture hall, 300 students.
A few people came in late. They were not disruptive. Prof gets pissy about it and does something kind of dumb. She tries to lock the doors, but can’t do it. Realizing she doesn’t know how, she stomps back to her overhead projector. Class titters.
A few minutes later a girl asked her to return to a previous overhead for a moment. Prof refuses, saying, “We don’t have time to go back. And anyway, it’s all in the textbook.”
Prof resumes lecturing. The girl then stands up and begins to leave. Prof does something a little more dumb - she actually stops and asks the girl where she’s going. She replies, “Well, you’re not going back to the overhead I asked you to. And if it’s all in the textbook anyway, why do I need to be here?”
Class titters. Prof looks mad, but doesn’t answer as the girl departs. Prof’s jaw sets and she returns to lecturing. Only the class is still tittering.
Then prof does something irretrievably stupid. She looks up and asks sarcastically, “Does anyone ELSE having anything they’d like to discuss?”
So who do you think raised his hand? She looked surprised when I spoke up, clearly having thought she’d asked a rhetorical question.
“Yes, I do. I’ve been sitting her for the last ten minutes watching you try to lock doors and fight with students instead of teaching us biology. I don’t come here to be treated like an elmentary school student. And another thing, I’m paying for my education myself, and I don’t expect to be locked out of a class that I’m paying for. One day it might be me arriving a few minutes late for some reason, and I assure you I’m coming through that door!”
Class applauds. She goes back to lecturing. Later in the day she found me in the lab and, get this… Gave me the opportunity to apologize.
I looked at her carefully and explained that I was sorry if I was rude, but that I meant everything I said. And that if she tried to lock the doors again I’d speak with the dean. “Besides”, I said, “you asked if anyone wanted to discuss anything further.”
I don’t know where these profs get their balls. However, I’ve only run into one or two types like that in all my schooling, so I think they’re in a very small minority.
I’m a teacher myself. I understand the need to run an organized classroom. But locking students out preemptively is not a way to do it.
I also understand not to ask stupid questions to a group of people you think are cowed - but I knew that before I was a teacher.