alt Hacker NewsI see overt racism and sexism posted here frequently.
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.
I don't even know what your thresholds are. They could be very low, like misgendering something and you see it as sexism - or simply refusing to call someone "they". For all I know you could be one of those people who stand up and call that sexism or transmisogyny.