My own personal experience:
When I lived in Tulsa, we lived on the outskirts of the city, smack dab in the middle of a largely Latino (Mexican) neighborhood (On Birmingham Place, north of the highway, for those familiar with the area). Noisy? Yep. Lots of music, visiting families, etc. Friendly? Absolutely. I never drove down that street without someone waving to me. (And, no we didn’t socialize.) I didn’t understand a lick of Spanish and I suspect the majority of my neighbors didn’t understand too much English, but that didn’t prevent our kids from hanging out in the yards and when I moved, several of the young men showed up (unexpectedly) to help cart boxes to the back of the rental truck. My kids frequently left toys, etc. outside and nothing was ever missing. Our detached garage never locked, and stuff never disappeared. The smells from the neighbors cooking…oh, how I miss those wonderful, salavating enducing smells (and the close distance to ethnic food). Very diverse school system, not a wonderful quality education, but not bad either. Absolutely on the lower socioeconomic scale overall.
Fast forward to Harrisburg, inner city, largely African American where we spent 10 years. High crime, lots of stuff stolen and the Hall kids were largely unable to socialize with the other kids in the neighborhood (threatening behavior, lying, illegal activities, etc.). The school system is horrible in nearly every way possible. Drug deals in the alley behind the house (didn’t realize they were smoking crack until I saw it on A&E), tons of domestic violence, and a shooting across the street (dead body that fell onto the porch. We saw the blood drain down the steps.) and a few blocks over. Lots of poverty, and those who are “ethnic” (Latino, Indian, Asian, etc.) keep to small cliques around the area and although I haven’t heard too much about it, defend their territory.
Three months ago, we moved to Suburbia and it’s like living on Wysteria Lane surrounded by the Brady Bunch. It’s a very quiet area, but Hallboy can ride his bike without fear of being accousted by a kid with a gun to take it. He can play with the neighborhood kids without seriously worry that they’ll walk out with his Gameboy in their pocket (actually happened in Harrisburg). I can sit on the front porch and read the paper without worry that I’ll get shot in the cross fire, or that someone will bust the window of my car to try to hotwire it (happened to a neighbor in Harrisburg). It is most absolutely white-bread America. People still walk their dogs (haven’t seen a pit bull since I moved here), but they wave as they walk by, instead of avoiding eye contact.
Diversity? I’ll cross the (Susquehanna) river if I want to partake, but I don’t regret moving out of it. If I could live in an area with diversity, but without the high crime, I’d do it in a heartbeat, but I don’t see that happening around here.