I don't think people are doing that so much as there's just not much to discuss there - sure, you can yell at people to parent better til the cows come home or talk about how our society is somehow collapsing because of this but no one will care. There's no proven fix, so not much to say on the matter.

Instead, people here are looking for realistic fixes - like making the chat box not automatically open so only those who need support will go out of their way to get it. I think the author would have been much less likely to receive abuse if people were actually there to ask her questions about her service than because they had just searched for a way to to generate a shitty meme. I could be wrong about that, but it'd be an interesting thing to do an A/B test with I think.

Perhaps it makes more sense to put it into security terms - In the same way that it doesn't make sense to don't go around talking about how we could live in a dream world where bots don't scan the internet for weak SSH credentials all day, it doesn't make sense for us to go around talking about a dream world where sexism simply doesn't exist. The author found a good compromise to defend herself against that threat - many people on HN are just suggesting other possible defenses.