This you?
Your stance that candidate seleciton shouldn't be based on immutable characteristics is fine. The issue is you only apply it to more recent justices you dislike, not the entire history of the court.
You sure you want to argue about knowledge on this matter when you didn't know something as basic as to why Johnson picked Marshall? Or the fact that you also plainly didn't realize that only black nominees were considered to replace Marshall?
The court at this point de facto has a couple slots reserved for non-white dudes, due to both Republican and Democratic administrations trying to balance the court demographically. There's no point denying that.