[ignorethefacts]

Not everyone who posts here is a coder but I do agree with you the narcissism and astro-turfing on HN is high.

I suspect the high-confidence/narcissist combination is especially high here due to this being an industry/entrepreneurial forum where being confidently wrong is a positive trait.

The astro-turfers appealing to the confidently wrong go by unnoticed to the majority.

The abstract of the study states the metric for over-confidence they developed is "the tendency to give incorrect answers rather than ‘don’t know’ responses to questions on scientific facts". I think that's true. I maintain that being confidently skeptical of confident claims and research is not the same thing.