I suspect the take comes from a very white collar background. If you're a highly educated immigrant you'll do well in America's coastal states, if you're a blue collar immigrant good luck entering the service class.
And this is actually backed by data. Contrary to self-image major US metropolitan areas are highly segregated, more so than the south, and interestingly enough the mountain west and plains states have the lowest levels of segregation
I do think it’s fair to say people in rural areas of any country have less exposure to people outside of their own little tribe. Hopefully this continues to change as internet becomes more omnipresent.
One-year-old children don’t form meaningful sentences, not even in rural America where families eat at Arby’s and holler out slurs at the TV.
You can find bigots and racist people everywhere in the world, including among immigrants to America.