I find it honestly surprising that I see it so much on HN. You have a group of people who largely identify themselves as being rational, objective, intelligent people - datascientists, engineers, etc. - who stereotypically I would think to be naturally sceptical and want to examine evidence closely.

But it's absolutely true, the minute some scientific study is posted there are 50 people writing comments that they believe it because yesterday something similar happened to their aunt etc. It's something I've never quite figured out.