I understand the provocation, but please don't respond to a bad comment by breaking the site guidelines yourself. That only makes things worse.

Your GP comment was great, and probably the thing to do with a supercilious reply is just not bother responding (which is easier said than done of course). You can usually trust other users to assess the thread fairly (e.g.https://news.ycombinator.com/item?id=44975623).

https://news.ycombinator.com/newsguidelines.html