Whenever I see a piece like this on Hacker News anymore (one that is going to provoke discussion), I am expecting a comment like this one. One that is equally as provocative in itself and taking the opposite stance.

People upvote these comments and they tend to make it to the top. This says something about HN.

What's wrong with comments like these ones is that they are being overly aggressive and argumentative for the sake of being overly aggressive and argumentative. Sure, being critical of others' opinions is a good habit to have, but disrespect is not.

In this comment, you tell the other site users to not waste your time on this and that this might just be an elaborate joke or sarcasm. That's pretty harsh for something that someone wrapped up together in their spare time and evidently put effort into it. Whether or not you agree, at least try to find the light in the piece of the work.

I know that a lot of people would be more inclined to read and accept an answer if you made it into less of a one-sided argument. Acknowledging both side and taking time to point out the strengths before the weaknesses go a long way and add to the overall politeness of the comment.