Anyway I'm thinking it's like this new seemingly on-point view on cultural appropriation that I heard some time ago.
Okay, so those (white) people aren't doing anything criminal for indulging in something they sincerely non-maliciously appreciate. It shouldn't be forbidden, okay.
But the contention is IF for that very same reason or feature thing (religious garb, skin tone, whatever), a whole population faces chronic systemic mistreatment - which IS where the original shitshow of blackface came to be - then while malicious blackface is no longer done (at least in the mainstream, since asshole nobodies can still do it), then those minorities still enduring problems and getting the short end of the stick are going to be understandably pretty put off at the whole state of affairs, it's much larger and extends beyond the cosplay.
It's like, "I mean, good on you for that totally accurate reproduction of this feature, that color, this tone or that attire

I mean, I'm not living as a systematically mistreated minority. Most of us in this circle aren't. And yet we can't even properly put such circumstances into words, can't begin to describe or understand it beyond feeble approximations. So imagine what people who've been in this their whole lives must feel. They're gonna have some words about this... but it's a God-given miracle that we're just getting words, all things considered. Tea's been spilled for less.
So some sensitivity to this big issue would be nice. Especially amongst crowds that would throw ridiculous shitfits if patch #345.VXW7 of the Triple A-rated Final Bloodsouls 22 is buggy af or if the epic finale requires a super pricey DLC because the thing was actually incomplete as shit when shipped out.