It would be no difference at a college than at an integrated high school - the different groups still sit together at lunch by race, ethnic groups, religions. The difference races may play on the same team, enjoy the same activities, but when those are over, the participates head back to their original groups.
My daughter goes to a very diverse school with 1/3 of the students from other countries. When you look around you see a lot of diversity, students of all races working in labs,playing on athletic teams. After hours, you see international students heading to the international dorm, groups of black students hanging out together, groups of Chinese students heading to dinner together and speaking Chinese. No one is unhappy with this, but it is not quite as integrated as the numbers would have you believe. Academically, yes, but socially, no.