I think the claim is supported logically by the fact that no purely logical reason for considering races to be inferior or superior seem to be possible. If they were possible, it should be easy enough to find them, or they certainly should have been found by now, and yet they have not been, and seemingly cannot be, found, hence the conclusion that they at least do not seem to be possible.
This is a problem that is very widespread and I think it stems from an inability to ground human dignity and worth in anything in post-modern liberalism. — Count Timothy von Icarus
My suggestion would be to think about a vegetarian who confronts you, "No species is, tout court, inferior to another." Do you have to stop eating meat? Is their claim falsifiable? Does "tout court" have a discernible meaning in that context? If we cannot enslave those of a certain race, can we enslave those of a certain species?
(Of course it is possible that this suggestion will only confuse you - haha. Still, if natural reason can make these sorts of judgments about species, then at least some "tout court inferior" claims are not nonsensical or unfalsifiable. Note too that racism only came to an end with substantive answers to the falsifiability question. Racism would never have come to an end if we just claimed that the racist had the burden of proof (because the burden of proof is culture- and time-relative).) — Leontiskos
Another observation is that “being at cross purposes” seems to play a fairly significant role in dismissal. — Leontiskos
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