before moving to a nice part of the OC my parents owned and ran nursing homes in Riverside. We lived in the Woodcrest Hills area and it was really nice (all the houses were unique and big and had pools almost gated community like), ... for all the diversity you see in southern california, most of the races actually kept to themselves in insular communities, especially the asians and jews. even socioeconomically there isn't that much of a mix, its mostly homogeneous communities where whole towns are well off or poor, of a certain racial demographic, and weren't really friendly/neighborly. this is how my 8-10yo eyes saw it in the late 80's. does it occur to you that maybe your impressions are based on where you lived? my neighborhood is incredibly diverse ... probably 5-6 nationalities and/or races within a half block in either direction. of course, we don't have gates.