But in this case, I think they are identifying an implication of "not making generalities" which I find to be perfectly appropriate. It reminds me of the robolending scandal, and how companies involved tried to deflect systematic criticism by suggesting each instance of robolending needed to be reviewed on a case by case basis without drawing why systematic conclusions.
It's meant as a criticism of how "don't make generalizations" can be used to deflect important and appropriate criticism, and I don't think it's just a case of someone changing the subject randomly.
You can object to style without having to signal to the community that misinterpreting comments is an accepted practice.
Endorsing the misread as the cost of doing business in order to reject a comment over stylistic objections signals that misreading is to be embraced as a community value.
I found their tone quite sneering and flippant, and so I parodied it (pretty mildly, I might add, the implications are right there in the comment I replied to).