What does “immutable” have to do with anything? We don’t (for example) say that it’s OK to discriminate against Jews because they could always convert to Christianity if they get tired of being discriminated against.
What does "OK" mean in the above sentence?
It's not PERMITTED for the Federal government, or the states after 1866, to deny Jews the equal protection of the laws or the privileges and immunities of US citizens if they are US citizens. It's not PERMITTED (assuming the Civil Rights Act of 1964 is constitutional, at least in part) for private parties to disfavor Jews in the letting out of public accommodations.
Otherwise, it's perfectly allowed to discriminate all you want. It's ignorant, and churlish, and keeps company with some really vile characters from the pages of history, but it's probably "OK" unless you are using "OK" in the cultural Marxist sense.
Please clarify.