The white liberal response you describe is no different from the white response POC’s get in all other settings as well.
As you point out, it is yet another elaboration of white supremacy.
As with white women, this group is one which centralizes their oppression while disregarding the fact that the overarching oppression, worldwide, is white supremacy. Like white liberal women, who continually centralize their own gender oppression while simultaneously pretending the elephant in the room, race, is not as relevant, white gay people do the same.
White supremacy is the overarching fascism which has damaged the entire planet. All white people, regardless of any other form of oppression, should not only understand this but also place it centrally, where it belongs. Are you white? You have an advantage.
Around POC’s, white people should ALWAYS remember this: they have a massive advantage, regardless of any disadvantage, and that means it is time to listen to those who are oppressed.