And how was a minority population viewed as subhuman, terrorized by both legal and extralegal organizations supposed to participate in the market? Jim Crow was only one aspect of a century of segregation and persecution of southern African Americans. Your perpetuating this fantasy that it was all the legislatures' faults, when every historical indication was that the majority of Americans in the Jim Crow states had absolute no problem with the laws, or with the idea that blacks and whites should not mingle, even in the market square.
Again, I will repeat, business is not some separate entity, some creature that exists in a vacuum. It exhibits the same prejudices that the wider society does, because it is simply a facet of that society. The Jim Crow laws weren't forced upon all southerners, they were forced on blacks by a majority of southerners who wanted to make sure they stayed at the bottom of the pole.