Why the hell do writers keep acting like we live in a segregated world? Every single neighborhood I have lived in within the past 20 years has had a variety of ethnicities, religions, groups of individuals/families - including a gay female couple.
Even the smallist West Texas town has schools that include all sorts of folks from rich to poor, black/white/asian/hispanic. There is NO NEED to teach children about multiculturism - they live it.