Let me quote two of the entries from the "In Comments" section of https://news.ycombinator.com/newsguidelines.html

> Be kind. Don't be snarky. Converse curiously; don't cross-examine. Edit out swipes.

> Please don't post shallow dismissals, especially of other people's work.

Expressing negative opinions is fine. But perhaps you should have a fear of being rude. We are a community, and there's plenty of other people reading these comments. I value kindness and being constructive, neither of which the comment I replied to appear to express.