HN does not see kindly upon people pointing out rabid misogyny, because misogynists are easily offended, and may get the wrong idea that there behaviour is, well, wrong.

Edit: After reading the actual comment in the linked threat, they are surprisingly, I don't know, self-aware? I wouldn't write any of those posts myself, but it's also not quite as bad as one expects, considering some other fare I've seen in the comments to Scott Alexander's blog posts.