You obviously don't need anyone to tell you this, but for passersby for whom this has not been on their radar before: this is almost certainly true. HN commenters will on occasion be superior jerks towards anybody, but this is some loud posters' instantaneously adopted position when they see a name that doesn't code as male--for another example, see many `rachelbythebay.com` posts, where you have randos getting sniffy and assuming she's incompetent or junior for some Real Interesting Reasons.

By my estimation it is real, the proprietorship (who I like and appreciate personally, and I think are operating on good faith) of this community has often made noises about how it should be better. It's not, and it should be.