English isn't even the official language of the United States
we don't have an official language.
Various states have official languages (19 states + DC don't have any official language); of these states, English is indeed official, with a few states also recognizing native languages as official alongside English.
Of course that's beside the point, as even calling this sort of racism "thinly veiled" would be far too charitable.
These are the same people who think abstinence only education works. Safe to say they're a few fries short of a Happy Meal.