There is/was also a profound difference between /b/ and most of the rest of 4chan though. Not all of the site is /b/, that's just the most famous. It definitely set some of the culture of the other boards, but not to that same degree.
The video game/tabletop game boards on 4chan were fairly normal for boards at that time, and it's not like everyone who was active on 4chan was there to post or read /b/. You might dip into it for a laugh or dare now and then, but at least when I was younger it was more like the internet equivalent of sneaking into the abandoned house down the street: a "dangerous" thing that felt cool to do.
We definitely had different experiences, then! I would say most forums, even a lot of the mainstream ones, tolerated some level of 4channess. Facepunch forums ~2009 was the first time I thought "wait, are these guys actually Nazis or just think it's hilarious to act like they are?" Stickpage.com forums ~2005 taught me an important lesson in not clicking URLs from domains I don't trust -- ESPECIALLY if they end in 'hello.jpg'.
Like I said in my original post, that's the lens through which I viewed the internet. It could be different from yours.
I'm not trying to 'normalize' 4chan but, honestly, I've bounced from plenty of Discord servers that are indistinguishable from 4chan. I think it's OK to recognize that at least some part of the non-4chan web is still very 4channy.
Every where banned you for gore, child porn, harassment, encouraging suicide.
I really don't think you should be trying to normalize 4chan as thats just the way the internet is.