Their comment is against the guidelines and I've replied to them to point that out and also marked the subthread off-topic.

But your reply also breaks the guidelines, notably this one:

Please don't fulminate. Please don't sneer, including at the rest of the community.

If you wouldn't mind reviewing https://news.ycombinator.com/newsguidelines.html and taking the intended spirit of the site more to heart, we'd be grateful.