Besides OP saying “white fatigue”? It’s because the white population has been seen as more default in a majority of contexts, which affords them the ability to not separate the good members of the population from the bad. Hence terms like “white trash”. This is something that should also be afforded to the black population, but instead politics fights against this to maintain a stronger voting block.
Oop, meant to say “the ability to separate..” without the “not. But to make my point more clear. The use of the term “black fatigue” is inherently racist (there’s race built in). What I’m getting at, is that the deeper underlying reason for the rise of the term is not necessarily racist. People that are racist will latch onto the term, of course. But some are using it as a means to express their criticism of behavior, not really race.
It is a criticism of behavior though. The racial element comes from the fact that the black community has been socially and politically protected from that criticism in a way that other groups have not. I’d recommend you watch “Fact vs Fiction” or “Mody Speaks” youtube videos on the topic. This whole situation is pretty complicated, especially as tempers are at a high with Karmelo Anthony and Shiloh Hendrix as major cultural moments.