It happens in degrees, and the degree here is much lower.

I disagree. Reddit users are out to impress nobody but themselves, but the other day I saw someone submit a "Show HN" with AI-generated testimonials.

HN has an active grifter culture reinforced by the VC funding cycles. Reddit can only dream about lying as well as HN does.

That's a tangential problem.

HN tends to push up grifter hype slop, and there are a lot of those people around cause VC, but you can still see comments pushing back.

Reading reddit reminds me of highschool forum arguments I've had 20 years ago, but lower quality because of population selection. It's just too mainstream at this point and shows you what the middle of the bell curve looks like.

its actually the reverse, dunning kruger is off the charts on hacker news

I don't think there's a lot of groupthink or virtue signaling here, and those are the things that irritate me the most. If people here overestimate their knowledge or abilities, that's okay because I don't treat things people say as gospel/fact/truth unless I have clear and compelling reasons to do so. This is the internet after all.

Personally I also think the submissions that make it to the front page(s) are much better than any subreddit.

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