There are a lot of ways to explain that power imbalances are critical context to racist statements. Yes, when black people say racist things in America, it's racist, but when white people do it, it's racism.

But the very best explanation is long-form stand-up comedy. If you don't understand, you really should watch this.

https://www.youtube.com/watch?v=dw_mRaIHb-M

Brtt was too charitable. You are completely off base here, but hey, way to prove the writer's point!