Its interesting to see you say all that JHB because the position of the New Right in the eighties in the UK which was extremely libertarian, in a free market sense at least but also going beyond that to legalising blackmail, vote buying and the sale of organs, and they sold their free market economics as in tune with anglo-saxon culture. It was very racialised.
To be honest the right wing is going to swing between supposed "economic man" and "cultural man" as it suits, whatever's popular and wins votes. I dont believe that either are perfect reflections of how people actually are, they're ideological constructs, behaviourial economics is less myopic and blinkered than the versions you're fronting but I'll bet you'll consider them bunk if their findings dont conform to your theory.
So far as race goes, well the racists used to be southern democrats, then they became republicans, now they're libertarians, whatever ideology suits as a flag of convenience for them.
People are talking about how Rand will be labelled and if it'll lose him support it could win him support, in the UK the conservative party became popular because they suggested that proprietors of B&Bs who didnt want to offer a service to homosexuals should be permitted to run their service how they liked.
Its unlikely that there's going to be a debate about why anyone would refuse a service to anyone, instead how whether or not they can, and they already can, they just cant be open or honest about it, they've got to convive and deceive because its an outlaw thing to do. I'd prefer people talke about why, instead that's taboo, sexism, racism, sectarianism, identity politics, in so many ways attempts to create equality have just translated into being unable to talk about the thing without people getting hot headed.