I don't know, I would have to have been there to make a call on it. Maybe it was different. However, if someone in truth acted toward me they way Drew described, I would leave that dojo immediately and never look back.
Yes, I agree with you Larry on that part (the instructor's behavior was wrong). I was reflecting just on the response I guess - a "Yes, sir" can be non-committal, more an acknowledgement of communication received, rather than being subservient.