That is a terrifying quote and it's certainly likely to resonate with a lot of people. I think it hits the nail on the head slightly and why I think we must move away from identity politics and back towards liberalism. It was working... that guy (as subjective as his opinion is) was part of a generation who grew up more tolerant than their parents and grandparents. Things were moving in the right direction - perhaps not fast enough... but definitely in the right direction. It's a sad realisation for the world that this is the likely end point of many discussion. Them vs Us ad infinitum.