Yes. That has happened to me.
I was covering a spinning classes for someone who was away for a couple of weeks. The group happened to love their spin instructor. Well, anywho, they were complaining about how it wasn’t challenging enough.
Initially, when I heard it I felt pretty bad, however, I realized that they had become accustomed to their instructor.
How did I dissolve it?
I came around the side of the lockers where they were dressing and apologized directly to them that the class wasn’t sufficiently challenging for them. I then let them know if they wanted me to seek out someone else to teach the class for them I would be happy to do so.
I was so surprised with their response. They started to say, that it wasn’t me personally, it was that the class was not difficult enough. I continued to extend my offer and let them know that I was not personally offended. I just wanted their experience at “their gym” to be a positive one and I would do whatever I could to make that happen.
In the end, they said it was okay, they would do the class until their spin instructor came back from vacation. Some continued, others didn’t do classes at all.
I found the response to not come at all silly because even the easiest of spinning classes is better than no class at all.