Tim, one other thought on this.
Identity politics, once made normal or part of the mainstream, cannot be limited to certain, approved groups, especially once legislative benefits and losses are associated with such identification. Arguably this has been going on since Wallace and Nixon but no one has ever seen fit to stop it.
So "white" nationalists (ahem alt right) influences broke out into the fore. Is anyone surprised, really? Identify as 'black', identify as 'hispanic', identify as 'gay', identify as 'female', identify as 'muslim'.... what's next do you think?
It's a bad development but it has always been a dangerous game.