it’s part of a wider trend of labelling all fashions and trends that came out of black communities as trashy. The opposite of them being “wholesome”. The natural beauty trend is heavily focussed on natural white beauty.
I agree that fashion, and elegance in particular, is more often than not a class indicator, but also a tribe indicator - think indie or goth, for example.
Elegance is usually associated with restraint. That runs as true in Accra or Lagos as it does in London or New York. The colour (or wealth) of the person wearing it does not define it - their choice in presentation does.
"Trashy" could well be the opposite of elegant. It is excess, exuberant, loud. My first real introduction to "trashy," and very long dramatic nails, was via the Essex show that grabbed for a while about 10/15 years ago. But they were white. The style was velour tracksuits, long, died blonde hair/extensions, very long nails and eyelashes, lots of makeup and big boobs. The Kardashians feature heavily in that realm too. All of it is the opposite of restraint - it is kind of like a conspicuous consumption - the more the better, the bigger the better, the louder the better.
That look, in both white and black communities has been going for a while now. Change is inevitable, especially in fashion. A move away from that is inevitable. I am not sure that the move itself is colour coded.