Seriously. There is less neighborhood "diversity" in the liberal Northeast than just about anywhere else. It's done through zoning. "Why, sure, ANYONE can live in Safetown New Jersey, regardless of race, color, creed, sexual orientation or place of national origin -- just so long as they have the requisite $2.5 million to buy the average Safetown house on the minimum 4-acre lot".
Ping .... this is responding to your quote (that I referenced in my post).