The important aspect is to offer relevant and helpful feedback. If users are going to spend time with an app it is important to listen to their experience, even if some of them may lack programming experience.
For those who have programming experience, being self-critical in order to improve a design is not much different from from sharing the same type of considerations with the designs of others.
I can get that he wants to make some specific point about a particular instance he has observed, but he makes it a vague universal instead and hints that regular users should keep silent.
I wrote a response attempting to nuance the matter.
Yep, I saw your reply, that's why I got to see the original note. He turned a simple matter of "be polite" into a stupid statement that basically equates "let's go back to the Paleolithic when everybody had to do everything".
