There’s a place in one of Martin Luther’s nativity sermons where he asks something like,
“Do know what a stable smells like? You know what that family would have smelled like after the birth when they went out into the city? And if they were standing next to you, how would you have felt about them and regarded them?”
He is saying, I want you to see Christ in the neighbor you tend to despise—in the political party you despise, in the race you despise, in the class of people you despise.
Christmas is the end of thinking you are better than someone else, because Christmas is telling you that you could never get to heaven on your own. God had to come to you. It is telling you that people who are saved are not those who have arisen through their own ability to be what God wants them to be. Salvation comes to those who are willing to admit how weak they are.