I wouldn't say it felt adolescent. Adolescence is full of misunderstandings about the world, but usually there's at least some internal logic where you can see how a wrong understanding is logically taken to the wrong conclusion. The start and end are both wrong, but the steps from the start to the end are right. At least that was what I remember from my days of adolescence.

Reddit actually felt more lazy than adolescent. It's like most people just couldn't be bothered to think (or read for that matter). The vast majority of comments just felt low-effort or even no effort (like the case where people just comment "This") and opinions are formed solely on "what's the first feeling I get" than then get defended into absurdity, because changing your opinion with new information is a cardinal sin on Reddit. Sometimes you could get an intelligent discussion but, especially in recent years, you get the equivalent of a thumbs up if someone agrees with you or just straight up hate if someone disagrees.