As a long time Usenetter, I don't care about the first two sentences being abrasive, but the material in quotes is insinuating that the replied-to grandparent at some point contained that verbatim text. I have a hunch that it did not, which is not cool. Particularly because the text is negative, making the false attribution defamatory, which is a different category from insults.

Yes, using quotation marks to make it look like you're quoting someone when you're not is a trope of internet aggression and something we've long asked HN commenters not to do: https://hn.algolia.com/?dateRange=all&page=0&prefix=true&que..., and is one of the reasons why the GP comment was abusive.