When your vision of property rights precludes the Civil Rights Act, then your vision of property rights is dumb. I think we all want people to be able to make their own decisions about how to run their businesses, but most of us, when we encounter things like discrimination (or child labor or whatever), we acknowledge that there is a role for... I dunno... laws. Libertarians like Rand Paul, on the other hand, just dig deeper.
This could be your next Senator from Kentucky.