From previous thread:

re: #27 Dread Pirate Ron

How can person from race [A] be racist to person of race [B]? Well, it’s pretty simple: if person of race [A] is pedalling racial stereotypes of race [B] to a person of race [B], then person of race [A] is being racist. It doesn’t matter which race that person of race [A] is, what matters is the pedalling of racist stereotypes of race [B] towards a person of race [B]. That’s the racism, and it doesn’t matter what race [A] is, it’s still racism against [B].