If this was condoned by the US Supreme Court explicitly, this was the law of the United States that anyone anywhere could be discriminated against based on the color of their skin.
The federal army - ie run by the US was officially segregated until 1948 but it really was through the late 50s.
https://www.archives.gov/milestone-documents/executive-order...
The GI bill run by the federal government was discriminatory
https://heller.brandeis.edu/news/items/releases/2023/impact-...
You don't think that's childish?
If you want to go by just one SCOTUS ruling to make your argument then why shouldn't we go with just one to make mine? And for that matter the number of rulings that make my argument are many many more than those that make yours.
Now what?