This is the worst of racism. The next time a white HNer tells PoC to just turn the other cheek toward racist words, point them to this. Racist attitudes are what enable horrific crimes against blacks, such as these.
But this requires some curiosity and interest in learning which biggest and racists might not have. And frankly it is hard to change people's mind when you are calling them names. People tend not to listen to people they don't like.
We also have to accept that racism goes both ways, it is just that white racism has much more severe consequences for black than the other way around. But I believe it helps maintain white racism to some degree.
I am not American, so I can comment on this as an outsider, and I can very clearly see that many American blacks have a big issue with whites. It is hard to win over whites if they only have bad experiences with blacks and also see no point in educating themselves on the issue.
I am not passing out blame. I am just saying, everybody can contribute to making racism a thing of the past. The ones who have to do the most are whites.