Freedom of association applies to people not businesses
Then why did you bring up "Freedom of Association" in the first place, since we're talking about two businesses?
Whether its moral or not can be debateable but its never illegal
I never said it was illegal, and I don't care if it is illegal - AFAIC, the US legal system has as much to do with "right vs wrong" as who the next Dr. Who companion is has on the orbit of Neptune.
and the right does it just as often.
If you're trying to make a case for being better than them, the kindergarten playground defense is probably not the best way to go about it.
But apparently boycotts are only oppresive when the left does it ?
You also didn't answer the question of why it's there's no moral (i.e. completely orthogonal to the law) contradiction in using "Freedom of Association" to ostracize and/or deny livelihoods to people who do or believe what you consider to be reprehensible things (as long as they're not religious reprehensible things), and someone else doing the same thing for doing or believing things they find equally reprehensible.
You're the only one talking about "right and left" and oppression. I'm talking about internal consistency, and the all to common lack of it in this position.