When we post moderation comments here we're not making any statements about acceptability in general! Only about what tends to have a good vs. bad effect on HN, relative to the goals of the site (which are described at https://news.ycombinator.com/newsguidelines.html).

HN is a specific kind of web site and all we care about is keeping it on track for its particular purpose. I'm sure those comments are entirely acceptable in many other contexts.