well, abstracting from any kind of a social construct (if that is what you're trying to argue about) and from a zoomed out perspective for humanity as a whole, mutting up the planet makes for an all eggs in one basket scenario, where one pathogen can target everyone equally and just wipe us out. genetic diversity lowers the risk significantly. diversity is our strength here. just this one argument should be the proof that racism is not about annihilating the browns and that constructive racism exists. i'm sure that you can find dozens of cases where genetic diversity similarly helps humanity as a whole, while mutting it up hurts it, without resorting to brown annihilation or eugenics. like for an example the erasure of culture that happens under an imperial mutt race. for an ideology that supposedly cares about preservation of indigenous culture and its appropriation and so on, the proponents of it do not seem to mind the erasure of the indigenous people's genes and the experiences bound to them. they're very invested into pushing oppressed pocs into mating with the white colonialists, which is exactly what the colonialists did when they colonized these people. that right there is an ideological dissonance that is resolved by racism.
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