[Marsh.]

But where in this story, or even in Justin Bieber getting dreadlocks, does it suggest either had a hand in creating it or calling it brand new?

Celebrities bring all kinds of age old fashion statements to the fore again and again and make it a "trend" for a while. That's just pop culture for you. It's got nothing to do with origin.

In situations like this, it's not a simple "Black people" and "white people". Justin Bieber has dreadlocks, not the entire "white community" so I don't see how it conjures up whining about stereotyping. He is one person.