Yep, 4chan is the Nazi bar of the Internet, and cherry picking an example of innocent shitposting means nothing.

It had its moments, twenty years ago, but all the worthwhile anons left ages ago.

There's even a fairly famous quote from a 4channer about it.

"Any community that gets its laughs by pretending to be idiots will eventually be flooded by actual idiots who mistakenly believe they're in good company." -Descartes né Anon

Of course, Anon still missed the real lesson.

There are always far, far, fewer people "just joking around" than the good people in the room want to assume.