It occurs to me that most of the so-named proles are perfectly decent neighbors. A thought experiment to prove this follows:
How many low middle class/upper lower class neighborhoods in the US would fail to become nice places to live if you could eject (or ideally, prevent from living there in the first place) the worst 20% of the residents? Not very many I wager. But under a PC multiculturalist regime, only rich people are allowed to live in nice neighborhoods, and only by erecting economic barriers to entry.
It has been said that the worst part of being poor in the US is having to live next to other poor people. A huge part of this is that people outside the upper middle class and upper classes aren't allowed to maintain control over their own neighborhoods. Hell, under high diversity, they can't even maintain soft power by controlling normative behavior. And if this isn't bad enough, the SWPL/DWL crowd even supports stuffing Section 8 residents into whatever lower income neighborhoods are too functional for their tastes.