Declaring that low-income people won't obey noise ordinances is extremely classist in my view. Yes, tell residents before they move in that the area has strict noise ordinances, and then hand out tickets for violators. But don't block affordable housing simply because it "might happen".

I'd like to agree -and in principle I do, just not in practice. In my case, I didn't have a loud muffler because I liked it. It was rusted through and I could not afford the repair. It had to wait. Ordinance or not didn't influence my choice. That's different from the guy who opens the throttle on his wannabe Harley as he accelerates from every stop sign on the street at 10 and 11PM... He does it just because... he's an...

Still, you must concede that the parade of "rusty muffler" arguments are a silly compared to a legitimate housing crisis. Not everything our neighbors/family/friends do makes us happy. And hey, they might have a rusty muffler, but maybe they're less snobbish and more friendly. So while it's totally reasonable to be worried about traffic and school crowding, I feel people should at least try a bit harder to shrug their shoulders about the little things and give it a chance.

I can see a system where you build where land is affordable, you bring transit there and you have buckets of units. Units for families, units for college kids, units for singles and you stratify the units so that like people end up with like people. Those who like quiet get quiet neighbors, those who like noise get noisy neighbors. Mix climbers with climbers and losers with other losers. You don't need groups that drag down others dragging down people who have a chance and you want climbers helping others.

This won't work in the US for various reasons, but it may work in other places where they can move people accordingly.

People disapprove of everything that involves "segregation" of different sub-cultures, even when that segregation is mutually beneficial. The American ideal is a spatially-uniform melting pot.

I’m not so sure people in Eastern Europe or parts of Africa and Asia would have an issue with this kind of stratification, but you may be right, it might go against cultural norms.