I'm not going to argue with someone who has been on HN for so long "but never seen it", because that likely means you're one of those people who will argue indefinitely that "questioning biological gender" isn't transphobia, and that transphobic discussions just... aren't!

it's there, I urge you to be aware of it in the future and not harass people who are making others aware of it. and absolutely don't tell people that they're wrong for the transphobia they have often EXPERIENCED. (And no, you don't get to ask trans people to bring out the receipts of their trauma, wtf?)