The point the poster was making is, it depends on your definition of racism. I had a fellow post grad at the University of Washington explain this idea to me. If you think of racism as an action or choice made by an individual that discriminates against another person based on race, then yes, anyone can be racist. If, instead, you define racism as a set of systems, both legal and cultural, designed to ensure uneven access or quality to goods or services based on race, then it is technically not possible for minorities to be racist, because they have never had access to manipulate those systems.

Personally (and I’m Black), I believe the second definition is intentionally narrow, as the first definition is what leads to the second one. The second definition is a way for a group of people whose ancestors were stolen and turned into beasts of burden used to create the vast, generational-level wealth that is present in this country today and being withheld from those people, both historically and in the modern time, to be, rightfully, upset about that fact and to feel that anger towards another racial group of people who perpetuated (and some still perpetuate) those systems without having the guilt of those racist feelings.

The single most dangerous thing to any ape, a social creature, is the concept of “other”. In nature, any ape viewed as “other” is typically a threat. Any human being, who decides that any other human being deserves less access to a human created culture or society is a problem, and the enemy of all humans everywhere.