Not so! Check out the next sentence: "Thoughtful criticism is fine, but please don't be rigidly or generically negative." - https://news.ycombinator.com/newsguidelines.html

I'm sorry you felt targeted and promise you it's nothing personal. It's that we're trying for curious conversation, which the rigid-and-generic sort of negativity annihilates. There's not much room for curious response when a comment insists that the world is nothing but a "dog eat dog slugfest".

Btw, I believe that the deeper problem is that it's hard to tell how one's comments are going to come across. Most people underestimate the negativity they're contributing by a good 10x or so, which leads to quite a skew in perception. That could explain, for example, why you felt like I must be telling you to only do happytalk.