Except it's really not so clean. I just did an Alaska cruise, and the passenger set was about exactly as diverse as you'd expect: a ton of west coast tech folks and their families with pretty much the same ethnic backgrounds you'd see in a scrum meeting, a bunch of tourists from both Europe and east asia, etc...

Is that good/bad/classist/exclusionary/exploitive? Not really interested in engaging. Certainly economic unfairness is everywhere in the world. But "racial segregation" really isn't a good way to describe it.