Sorry, that was an error on my part: freedom of
association (in the context of providing public accomodation) was curtailed by the Civil Rights Act, not assembly. And your beef isn't with progressives if that's something you're taking issue with; it's with a couple generations of the Supreme Court, which is considered a relatively conservative branch of the government.
(IANAL disclaimer) The freedom of association has been implied by analogy to be protected by the explicitly-enumerated freedom to peaceably assemble in the First Amendment, in some specific cases. But it's a loose protection by analogy; the letter of the First Amendment doesn't even mention a freedom of association. The SCOTUS has not ruled that the freedom of association extends to a freedom to exclude in public accommodation; in layman's terms, the reasoning is "You have the freedom to serve as many people as you want, but that does not imply a freedom to not serve other people if you want to operate under the corporate charter that the government grants."
This overview describes things much better than I can. https://constitution.findlaw.com/amendment1/first-amendment-...
> The court was wrong and will be wrong again.
No doubt, but I don't think you'll find a receptive ear (in the public or in legal circles) to the notion that the Court has been wrong regarding upholding the Civil Rights Act.