It's a multicultural nation. You can pretend like it's 1955 all you want, but the climate is still changing, the world is still moving forward, and we're not going back to the days when old white men called all the shots.
I find the idea of anyone calling these (mostly) young people "divisive" pretty hilarious when we just elected a President who has the vocal support of the Ku Klux Klan. The people who want to divide the country from that kind of thinking are correct, and I think that history will prove them so.