Racism isn’t just about thinking someone is unequal to you which I don’t think is actually where much of the right wing wants to see itself. It’s also about promoting legislation that perpetuates or exacerbates legacy inequalities, even if inadvertently.
This seems to argue that if a person doesn't prioritize not perpetuating or exacerbating legacy inequalities above all else when weighing legislation, regardless of whatever other reasons a person might have, then that person is a racist.
Moreover, this seems to be a self-issued carte blanche to denounce anybody who disagrees with the author's preferred policy choices as racist, regardless of their actual reasons. (And in light of FLG's Time Horizons theory, this would probably mean even if the perpetuation or exacerbation is short-term, but ameliorated in the long run.)
FLG recognizes that he may have his own cognitive biases in this and might not be reading this passage sympathetically. So, he asks his more left-leaning readers if they have a defense, or to put a less negative connotation on this, an explanation of this statement.