I think it's one byproduct with how liberalism badly deals with racism, and that childish perception of racism gets adopted by conservatives or misguided moderates.
It ignores how racism affects material conditions and instead reduces it to just being just a few bad apples, just some naught boys. It's like a spiritual flaw, same way in how people blame homelessness on the individual hobo being a bad person and not the conditions they were put in, like the housing market, the healthcare system that doesn't treat his broken brain, or why he would be pushed to do drugs. He's just inherently flawed.
And like that, the uyghur word is bad because it's like some literal curse, the word itself is bad, and not because of the history and how it probably signals how you see your fellow man. So people equate saying rap lyrics on the same level as yelling slurs at a Klan rally.
I mean you probably won't like it if I refereed to you as stupidfuckingfaggotretard.
That's the best as I can explain it and why some people wouldn't say, even if they're "scumbag left"