What's your source on Plessy? Wikipedia says, "His father, a carpenter named Joseph Adolphe Plessy, and his mother, a seamstress named Rosa Debergue, were both mixed-race free people of color."

Where did the one drop rule exist after Loving v. Virginia?

I’ve never said whiteness is no longer a privilege in any circumstances. For example, I’ve often pointed out that while police killings are racially proportionate to poverty and therefore are about class, the statistics say the police beat black people more than they beat white people.

What fascinates me is the advantages of being white or being of color now change depending on the context.