It's usually couched in sophisticated-sounding faux-intellectual language, though, which is the key to posting whatever you want here. You can say literally anything on HN, so long as you camouflage it with SV techbro vernacular.
It must be some "ist" of you to assume it isn't transmisandry instead.
(And not sure that anything related to gender identity specifically divorced from sex is "sexism.")
This means your threshold is fairly low.
You're allowed to have those opinions, of course. We can talk about other things.