Probably because the entire western world didn’t systematically buy and enslave kidnapped pale people, treat them as subhuman and breed them like livestock - so it’s not as touchy a subject.
Edit: Guess that’s still a touchy subject. You wanted an answer for why it’s still socially acceptable to joke about pale skin but not dark skin, and that’s pretty obviously the answer why it’s not the same thing.
Or maybe the downvotes are because the breeding only happened in the Southern US and French, German, British, Australian, and Belgian lemmies don’t wanna get roped in on that specific colonial history.





‘There’s always a bigger fish’