Sigh... the basic zoning principle of upper middle class and wealthy neighborhoods seems to be: just make sure that the teachers, police, firefighters, waiters, mechanics, nurses, cashiers and carpenters that I depend on for my day to day living can't afford to live here."
My almost all-white elementary school (this was VT in the 1960s after all) had kids from a trailer park of mostly single-wides, a kid whose family literally owned a railroad and everything in between. My sister was lamenting once that her daughters' suburban Boston-area school was all into "diversity" but mostly had kids of white engineers, black doctors, Asian lawyers, Hispanic accountants and so on. While everyone in my family had at least one good friend who lived in a single-wide, she couldn't figure out how her daughters would ever meet, and therefore understand, people who are struggling to get by.