This is a slippery slope argument. Owners of businesses have property rights (basic internet searches show that constitutional scholars see these are protected under several clauses of the Constitution, as well as under Amendments 3, 4, 5, 8, 10, and 14), just as much as gun owners have 2A rights. Which rights outweigh the others?
If one doesn't like the decisions/policies of a business owner, one is free not to partake of the services offered by said business owner.
If one doesn't like the decisions/policies of a business owner, one is free not to partake of the services offered by said business owner.