Because, like, they invented hoops...Egyptian, note the ears.

(Byzantine, 12th century)

But there are some cultural items which appear to be the exclusive province of "brown' people.
For instance, the nariguera, which was worn attached to the nose:

(from
https://en.wikipedia.org/wiki/Peruvian_art)
And, until relatively recently,
Lip and ear discs:

From
http://www.dailymail.co.uk/news/article-2786125/Documentary-crew-stumbles-largest-lip-disk-world-whopping-60cm-wide.html Which have enjoyed some adoption in Western Culture of late (don't ask me why).
And from Burma,
Neck stretching.
Now, if those "white girls" were doing that stuff, well, shame on them for all that 'cultural appropriation'. Now, if cultural appropriation is really a problem for these ladies, I suggest they give up their car keys and stay away from white bread and pasta for starters.
Or is 'cultural appropriation' okay when they do it?
(The contents of the melting pot are a long way from becoming liquid, and this stuff raises the melting point.)
Everyone has their ideas what constitutes beauty, and over the millennia, ideas have come (and gone) within cultures, been adopted by other cultures, and the meanings have changed.
For instance an earring on a man might mean (depending on time and place and ear worn) everything from status as the last of his line, son of a widowed mother, a slave, a pirate, a pagan (as opposed to Christian), royalty, homosexuality, a 'tough guy', or a combination--or nothing in particular (in terms of social status or belief) at all, except that they could afford an earring (or their owner could).
The idea that black or brown people are the only people who could look up at the sky and conceive of a circle worn in the ear is utter cultural poppycock. These idiots demean themselves by claiming such.