Yes, it has quite a long history of doing so. Racialism and scientific racism discussions happened all the time. Chen019 is the first name to spring to mind but there were others that posted almost exclusively on those subjects for years.
Not sure why you posted rules for P&E, but why couldn’t moderation discretion have used the don’t be a jerk rule? Everyone always talks about it being the #1 rule, but it is rarely used. This was a Cafe thread, not the Pit. He was a jerk and could have been modded for it with zero blowback.
I actually was a bit surprised to find out today that apparently the whole production staff was black. Not sure how or why that came around but i don’t see why that couldn’t have been asked and answered. Cartooniverse’s phrasing was way off, like it was a conspiracy of some kind.
That depends where you read now. Some say he wasn’t asked to leave. Some say he refused to leave. Some say he was not asked and did not refuse to leave at the same time.