More importantly, businesses do not have the right to refuse service for ANY reason, because discrimination is not an allowed reason. If your reason for refusing service to someone is "because they're black/gay/trans/etc.." then that is discrimination, and you will be rightly punished for doing so.
Ironically, we got this law (Civil Rights Act) in the first place partly because of mass boycotts during the Civil Rights movement, which I'm sure you'll be happy to know (/s).
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