People are certainly allowed to say that. Your comment, for example, hasn't been flagged.

However, a lot of the comments tending in that direction have been (1) generic and (2) flamebait and/or fulminatey, which are bad for HN threads and against the site guidelines.

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

Edit: you went on to post many of that type of comment yourself in this thread. Please don't do that again.