I wrote about that. A white woman coined the phrase and another white woman popularized it, which may be why it's popular with white people. Katz and Bidol were the McIntrye and DiAngelo of their day.

https://medium.com/a-universalist-in-an-identitarian-age/racism-equals-prejudice-plus-power-so-only-white-people-can-be-racist-f2906dba851