Because you can only have "diversity" if you have different races? Cultures don't matter for Patrick, who cares about the different ethnicities in china, they are all slant-eyed chinks speaking some languages Patrick doesn't understand, so they are the same.
Russia? Chechens are pretty much the same as ethnic Russians anyway, because they both hate homos.
Iran? Well, most people there speak Arabic together with their native Persian, so they are fluent in one more language than trailer-trash in denial Patrick.