Your examples are ridiculous. Your two "sounds like" examples are straight up racist (not that you think these things so please don't think that I'm calling you a racist). The other is just a geographical one that happens to span national borders. Even in the US, among the same race, people get paid less if they live in places that cost less. It has nothing to do with black or Asian. My company is based in California but has an office in North Dakota. The devs in ND make about 60% of what the devs in CA make. Nothing wrong about that.

But this guy was being relocated to the US. What wage is appropriate in India has no relevance to what is appropriate where he was being relocated.