Of course that's not fine, and no I didn't see it. We don't come close to reading everything, and I often don't look at the threads in linear order.
If you see a post that ought to have been moderated but hasn't been, this by no means implies that the mods secretly agree with it. I understand the temptation everyone has to leap to that conclusion, but overwhelmingly the likeliest explanation is that we didn't see it. You can help by flagging it or emailing us at hn@ycombinator.com. https://hn.algolia.com/?dateRange=all&page=0&prefix=false&qu...
Still, users here need to follow the rules regardless of what other users do, and that applies to you the same as to me and anyone else. Changing the focus to someone else's misbehavior doesn't help. Everyone always feels like the other person started it and/or did worse, so that's just a recipe for a downward spiral.
What we need you (i.e. everyone) to do instead is absorb HN's guidelines, take them to heart, and then make your substantive points within that intended spirit, whether other people are doing this or not. If you're willing to do that, you can continue to post here and make your points. But we need you to stop breaking the site guidelines, which you've unfortunately been continuing to do. (And yes, I know other users are breaking the site guidelines too. If I could change that, I would.)