https://en.m.wikipedia.org/wiki/One-drop_rule
All of the definitions are contested and subject to localities, not just whiteness.
https://www.researchgate.net/publication/263722423_Not_black...
>is that "white" isn't an ethnic group with an actual cultural or racial lineage.
None of them are. There's more genetic diversity in sub Saharan Africa than in any other place on earth. People from Asia and people from Africa don't identify as black or asian as a consistent racial lineage.They're also a western ad hoc hodge podge just as much as whiteness is.
https://en.m.wikipedia.org/wiki/Black_people
None of your explanations single out white people as an especially fake identity inconsistent with asian or black.