What is that?!?Businesses that are open to the public are for the most part NOT currently free to discriminate, except for those states which still have anti-gay laws. If the Right had its way, we would all be free to discriminate...which would give legitimacy to racism...and as soon as racists began refusing to serve people because of their color, people of that color would protest and the state would send police to protect the racist's "right" to discriminate...and THAT is the beginning of state-protected racism.
You y'all can't see that is beyond explanation.
Anyway, if the person who is running a business is saying that no X allowed or only X allowed, then I guess they really aren't open to the public. Not that it stops anyone from saying that they are open to the public and thus are not allowed. That would probably have to be the most basic false premise of the whole argument that businesses don't have the right to discriminate. Business are not open to the public. They are open to whomever the business owner wishes to do business with. That is part and parcel of private property rights and freedom of association.
As to state protected racism, yeah it's a sad by product of actually protecting rights, but that's fine by me. State mandated racism however, is completely off the table. That is also a violation of private property rights and freedom of association. The problem is that most people who want to violate rights for actions that they don't like is that they can't seem to separate the concepts of the state requiring something and the state protecting rights even when it's an objectionable action that is being protected.