"I'm not inclined to continue to try to drag it out of you." and "I don't welcome your assumptions about [me]" are personally abrasive. The site guidelines don't explicitly say "please don't be personally abrasive" but they cover that kind of thing with more general statements like "Be kind", "Edit out swipes", and so on.

Of course the GP post was outright aggressive, not just abrasive, and that is considerably worse. But we need users to stick to the guidelines regardless of what other commenters do. Not insisting on that just leads to a downward spiral, especially since it's human nature to underestimate the provocation in one's own comments.

Oh Dan, come on, really?! OP has been making all sorts of claims and failed to justify them with any more than "just look it up", and also making all sorts of assumptions about me. Saying what I said was about the most kind I could be in response. I guess I could just simply not contribute, as I had planned, but tomhow did explicitly ask me to here: https://news.ycombinator.com/item?id=44720318