I think this article ignores how segregated many neighbourhoods, social groups, families and workplaces continue to be, even in cities as diverse as Toronto. Case in point would be the Globe and Mail as typical of mainstream media and many workplaces.. Perhaps Saunders doesn't have a physical desk there, otherwise he might see what I mean if he just looked around to see that it is overwhelmingly white among reporters, columnists, editors and executives almost exclusively so. The same is true of many middle class neighbourhoods and certainly upper middle class ones, and too few people socialize, date or marry outside of their groups.