I agree. I think “racism” as short-hand for “race-based partiality” is great. But a friend of mine was recently explaining how black people can’t be racist because they don’t have a history of perpetrating systemic oppression onto white people. When the definition changes to some type of marxist confusion, then the term loses its usefulness. As long as the speaker and the hearer understand the word to have the same definition it works, but when they have different definitions, confusion arises. “Race-based partiality” doesn’t very easily allow for that confusion.