If your argument is that people who oppose broad work visa programs are secretly racist but won’t admit it, that’s unfalsifiable.

When a country has far more people seeking visas than it’s willing to admit, it needs some mechanism for deciding who gets in, whether that’s a lottery, eligibility requirements, or some combination. None of those is inherently racist. You seem to be arguing for a radical open borders policy that I doubt many people would support, in just about every country.