I did challenge the instructor - at least I had the courage to do that.
Why "challenge"? Your instructor isn't God, and his opinion is merely that. Why "courage"? Are instructors so unapproachable that it's really hard to ask them questions?
As an instructor, I hope my students don't feel like that. I'm quite happy if something I do makes them want to discuss radio usage. I hope I'm not doing anything which makes them feel as though questioning my decision is any kind of big deal.
I'm not trying to pick on you for your choice of words; I just find it a bit worry ng if the situation is really like that.
