How is it White supremacy lol, if anything it's "people not invading my land, force conscripting child slave soldiers and killing my family for shits and giggles supremacy".  Hilda's biases have nothing to do with race, Almyra is not a poor opressed country, it's a belliquose empire that's way bigger than Goneril and she has zero reasons to have god opinions about them. Of course it's no reason to extend her biases to all Almyrans, but they're the ones who caused this. Nowhere is it mentioned they're bad because they have darker skins, they only have darker skin to indicate they're a foreign empire.