I'd love to know why it's those in the whitest areas that hate immigrants the most.
I think it's also an element of the class system. The ultra wealthy elite who are using the media and social media to promote hatred and division are strongly targeting the white working class and underclass in this country as it gives them someone to look down on. A member of the underclass who lives on benefits and has never worked a day in their life is looked down upon by most, but racism gives them a away to feel superior.
As LBJ wrote, "If you can convince the lowest white man he's better than the best colored man, he won't notice you're picking his pocket. Hell, give him somebody to look down on, and he'll empty his pockets for you."