I find this post absurd on several levels. I will try to articulate my main points.
1. Aren't the "you can't be racist against white people" supporters the very same people who hate the "I don't see race" argument? If validating the existence of races contributes to racism, isn't that stance self-contradictory?
I cannot falsifiably answer the first question. In regard to your second question, yes and no.
Racism exists and perpetuates itself. To acknowledge it exists is to perpetuate its concepts of "race" (in hope that racism can and will eventually be snuffed out), but "not seeing race" is egalitarian rhetoric that promotes ignorance/is removed from the realities of political inequality.
2. The origin of the concept of race does not fully determine who will adopt the concept. Thus, race being (allegedly) a white invention does not relegate the concept of racism to white people. "Whites invent race -> another society, individual or culture adopts the concept -> discriminates based on what they perceive to be race"- that sounds like racism to me.
Socialization is a proven thing (about as much as sociology can prove anything). People are not raised in a vacuum. Following the definition as "racism is racial prejudice + power," a minority would not be in a position to practice racism. In America, minority means non-white. In other countries, minorities could be white. However, the seed of fault is white supremacy ("allegedly"), full stop. It follows logically that the fault of the victims of "racially motivated action" is white supremacy.
To compare and contrast, this would seem similar to me saying that the person who invented a gun is at the fault of everyone being shot. From a point of view,
this is true, but it's not as relevant or helpful to current firearms discussion as it is to race discussion. A difference is that guns are indifferent objects incapable of judgment while white supremacy and the concept of race are a prevailing culture/ideal of human bias. So the sociological definition is a helpful identifier of the existing root problem, particularly in American/much Western discussion.
Etymologically and practically, anyone can enact on "racist" ideals. However unlikely: theoretically, someone could believe in black supremacy and kill whites as a result. That would be racist by all practical definition, but it's a reaction in a long list of reactions to white supremacy. And you can be sure, as a result of this theoretical scenario and due to systemic racism, white supremacy would prosper because of this. In a roundabout way, the theoretical black supremacist action would serve white supremacy through reinforcing existing bias and resulting power dynamics.
Does this mean that prejudiced violence would not exist due to other reasons? That people wouldn't be prejudiced against skin color without white people interfering and creating "race?" Likely not, but one problem at a time.
3. That definition of racism is solely based on white people, so it does not hold up in any relationship between two people or societies of non-white ethnicity. Thus, you have to either relegate the definition of racism or relegate your statement that one cannot be racist against white people to societies with white people. I am not seeing anyone do either.
"Racial prejudice + power" was created by white supremacy, but it does not preclude the ideal from being enacted by other races with majority power in societies/countries other than America.
4. Why not find a new word for your own definition of racism? What does this concept of yours have in common with the regular definition of racism that it has to replace the known denotation of "racism" and not have another name?
Why does it matter? It provokes discussion and knowledge, and is a problem identifier. Racism wasn't conceived as an egalitarian identifier of peoples existing prejudice. It's intellectually dishonest to pretend it is. It was created specifically to justify oppression that continues to exist. The concept that "everyone can be racist" is fairly useless rhetoric which is self-serving to the comfort of the current oppressive power structure. Sure, "racism" could be less contentious if another word was given to sociologists, but what word would suit? Which is why I said that it's more-so political than practical.
6. In a social structure that discriminates on race, what is perceived as "race" actually MATTERS, regardless of whether it has scientific/historical basis or not. Individuals and communities are defined in SOME manner with regard to races in a society where races exist. Being willing to discuss a racial topic in this context does not propagate systemic racism as you imply, it simply acknowledges its existence and agrees to the bounds of that concept.
I agree. This was covered in my first response.