I read some of the confessions and comments on this site that were posted a couple of years ago. Someone had the interesting viewpoint that people are of different classes. I think the person who posted this was a man so I'll call him "he"... anyway, he said that the upper and lower classes don't mix because the lower classes can't help but drag down everyone else around them. He said that they didn't care if the neighborhood had trash, noise, loud kids, etc. and that if you wanted to live in a decent neighborhood where there were no problems, to get rich and move to one where the houses were $1 million. Later, he changed it to 2 million.
Well... as interesting as that philosophy was, I have to disagree with at least this point: Even the more expensive neighborhoods have their idiot neighbors that think that they can do anything they want, and to h*ll with everyone else. We live in a neighborhood that has houses up to the $5 millions... not ours, but some. One of the neighbors living in a more expensive house is a doctor who is as arrogant of a bastard that you'll ever meet. In fact, he's a surgeon so he thinks he's God. No one likes him, and he's ruining the neighborhood by his criminal activities. I won't elaborate about what they are, since the point I'm trying to make is that even though people have power, money and position, they can still be swine. In fact, the only pig I've ever seen had a much better personality than this @sshole.
I do agree with the previous poster that when you throw people together in one neighborhood, there will be people who don't mind dragging down everyone else for their own selfish reasons.