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That 4chan link is full of the vilest antisemtism, racism, etc.

Yep, it's their way of gatekeeping.

What do you mean by gatekeeping here?

They're belligerently racist to keep non-racists away? If so, why not just say they're racist and leave it at that?

Not racists, just others not like them. If you can’t tolerate that talk then you won’t be on the site. It keeps certain types of individuals out.

* I’m not a 4chan user

The vilest? Not even. That was a mild 4chan thread.