The concept of public accommodation laws have their roots in English Common Law, and were part of early American law as well.. Explicit anti-discrimination laws for protected classes are relatively new, meaning "nearly 50 years old."
Moving the goalposts, I see. Nice try.As for the rest, lots of things have been legal or illegal for 50+ years in the US and has/had SCOTUS backing....
You posited a slippery-slope or declinist claim: "I believe in peoples right to association, right to free speech etc etc. All of which are seemingly being dismantled, or people are attempting to dismantle them." I'm pointing out that anti-discrimination laws are nearly 50 years old, and the only real change lately is extending protections on the basis of sexual orientation. Even that isn't a slam-dunk, as many states don't consider sexual orientations as protected classes.
Fortunately, I'm not making any such claim. I'm certainly not saying "the laws exist, therefore the laws are ethical." Nor can any of my comments be reasonably construed as making any such assertion.Doesn't mean that those cases/laws are in the right. So making an appeal to authority isn't a valid excuse.