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.