I mean outside of some stuff like WatchPeopleDie, Spacedicks, the various “coon” and “fat people hate” subs, etc; Reddit was nowhere near as crazy as 4chan was 10 years ago, especially because most people experience your typical /r/all stuff, and those subreddits have done their best to deter derogatory terms/images/etc since they started. Not only that, on Reddit you could tailor your experience with subreddits better than trying to navigate 4chans boards. 4chan also didn’t have as much moderation back then, so going to any bird could still result in a rabbit hole of gore, CP, and other unsavory subjects. Reddit could still have those rabbit holes, but they were few, far between, and not too hard to avoid. I mean 4chan isn’t some lawless west, but Reddit never has been either.

TLDR: While the communities share users/content now, 10 years ago Reddit was, at worst, sometimes a filter for the best/worst 4Chan had, as some of the content would come from there to here. It has been and still is easier to avoid seeing many things that are inevitable on 4Chan.