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"It's actually quite an effort to intentionally diversify ones social circle." It is, like I point out as areas tend to be/become segregated. I have the same problem, work is way more diverse than where I live...
Is this an issue? Not perse, but as long as there are pockets of human rights abuses (religious groups), increased us VS them thanks to religious schools and "mixed areas" correlate with lower incomes, I think it may be.
Though the beautiful UK class system means society was already split to begin with...
My point is that your average Somalian, say, has no interest whatsoever in integrating with the 'natives'. They have different interests, different social mores, different moral perspectives. Just like the British ex-pats in Spain don't really have any interest in assimilating with the Spanish. It cuts all ways.
It's not necessarily racism or prejudice, because in a work context people tend to get on. It's more that people like what they know, know what they like. It's actually quite an effort to intentionally diversify ones social circle.