I've seen some pretty bad sexism on articles about women in tech, but I don't recall that on any posts about Asahi. Transphobic commenters also (subjectively) seem like a small minority.
It doesn't matter if they're a minority if moderation just lets them use HN as a megaphone and post hundreds of comments before any sort of reaction.
Or in terms of a tired metaphor: If you refuse to weed out your bad apples, you can't really complain when people stop taking your fruit shipments because they keep spoiling their bunches :)