I think sometimes we (more mature people with me included) may be a bit too harsh on younger people (or people with less experience). Take my very self as an example: My regular Pilates instructor was absent yesterday morning and the replacement, shall we say, was less inspiring. One student walked out. Instead of criticizing her in my mind, I decided to appreciate the fact that the class was not cancelled (could have been worse) and it was probably tough for her to stand in as a replacement. I used the opportunity to tap my experience (8 years with the same instructor who was absent) to adjust for the different style and pace.
At the end of the class, she asked me how the class went. When I was about to provide her with my 10-minute plus in-depth feedback, she “conveniently” changed the subject and promptly said “Have a good weekend!”. Well, it goes to show that I still need to differentiate a genuine request for feedback and a typical case of British “politeness”.