I was thinking about how the way Reddit works facilitates the "echo chamber" effect really strongly, similar to old forums and fediverse instances. They allow cultures where new information contrary to their beliefs isn't allowed to come in, and anyone delivering such will get toxicity thrown their way.
It's not even just regular politics either (and I'm using that term in a general sense, not "grrr muh liberals"). You can tell a Linux guy why you need to use Windows and they won't listen. You can tell a Mastodon user why you prefer Bluesky and they'll just shout "CENTRALISED! VENTURE CAPITALISTS!" and screech about Jack Dorsey despite him not being there for like a year or two now.
I like my forums sometimes, but frankly, I think I prefer the city square approach to that nowadays.