Pictures paint the islands of blue or orange in the center of the cities, surrounded by a sea of suburban red. Because just one street over is the wrong side of town. And they are in that school district, and we don't know them, and they don't think like we do, and they just don't belong with us. And that's how it is.
Your isolation perpetuates your ignorance--and your isolation is easy to see.
UPDATE: Some initial statistics have been released from the 2010 census