[mc32]

I'm all for not doing business with hate and or terrorist groups but I don't think I'd want to ground it on "freedom of association" basis as anyone could make that same claim for not serving a sub-class of people. Maybe protestants refuse to serve atheists, or vice versa, for example.

[zhemao]

Religion, race, gender, etc. are protected classes. Political ideology is not.

[mc32]

True, but some of those are not mutually exclusive. And while atheism isn't a religion by definition, in practice it might as well be.