There really were no free-market Republicans. This was merely dog whistle politics. The GOP slogans of "smaller government" never once brought about an actually smaller government. "Smaller government" was simply code for --- "we'll cut off welfare, which will hurt colored people." Poor white people in the USA have often gone along with policies that hurt them, simply because they liked the idea of hurting colored people in the process. The same with slogans like "law and order," which was code for, "we'll lock up colored people." — LD Saunders
I'd concede that these things are often used as covers for racism, or at least overlap with racist tendencies, but I also think you may be overstating the case. The underlying assumption seems to be that literally
anyone - at least in the United States - who expresses reservations about socialist economic policies, or the large administrative welfare state more generally, is ipso facto a racist. As much as I dislike the Hayek/Friedman sort of free market fundamentalism, I do think people can have genuine disagreements over the nature and scope of government, over which policy is more conducive to a thriving economy, etc. that are not related to racism. At the very least I don't rule out that possibility and assume horrible things about a person's character based on their political and economic views. (unless of course they're unapologetic Nazis)
If it is true that these economically conservative positions are
always held insincerely to conceal racism, then it would seem to follow that they wouldn't have advocates in countries with racially homogeneous populations, be they white or non-white. I don't believe that's the case but I'm willing to look at relevant data if you can direct me towards it. I just don't see the necessary connection you apparently do. Moreover, you'd have to explain cases of POC living within the US who prefer that small government, individual freedom and responsibility narrative. They're out there and I don't think they'd classify themselves as white supremacists.
Finally, and out of curiosity, what part of the United States do you live in? I've lived mainly among whites and Latinos my entire life and have met only a handful of self-described white supremacists. Seems dangerous to broaden out the notion of "white supremacist" to include anyone who finds Trump preferable to alternatives, or who finds traditional Republican policies (even if not perfectly enacted) to be more congenial to their worldview. The fact that some (or even many) Trump supporters also hold white nationalist views does not mean that all of them do. We may vehemently disagree with people who hold these economic/political positions and think they've been misled, but this implied racism seems extremely uncharitable.
Trump's rhetoric is often careless, he's a compulsive liar who's full of himself, etc. but I don't think he's an aspiring Hitler. He's no Jesus either, of course. And I genuinely don't think the supporters of Trump that I know - including family and many Mexican-Americans - are white nationalists/supremacists. There are some out there but to tarnish
all of them with these serious accusations seems incredibly dogmatic and unfair. To re-emphasize the main point of my earlier posts, I think there's more to Trump's victory than can be explained
solely by racism, even if that may have been a contributing factor.