You have been using HN for over 10 years but don't know about the flamewar filter? There is some magic comment to upvote ratio that bumps posts down once reached.
Edit: Including this troll that only emerged well after the post was flagged: https://news.ycombinator.com/user?id=BroFrFrNoCap
Or maybe it's your alt? Couldn't downvote this post though could you?