We've already heard that Democrats are three times as likely as Republicans to defriend people on social media over political disagreements. When your entire identity is tied up in your political opinions - and you've sold yourself on the idea that opposing opinions are not only wrong but fundamentally evil - you can back yourself into a moral corner in which you can't live with yourself if you associate with anyone who thinks differently.
But de-friending people on social media is easy. If you've got 1,000 Facebook friends, you probably don't even know a lot of them in real life. Offending opinion expressed? UNFRIEND button pushed. Smack the hands together. Your problem is solved, Arlo.
But what do you do if you actually do have friends in real life who are on the opposite side of the political spectrum, and the election of Trump has made you newly appreciative of the imperative to dissociate yourself with all bur the ideologically pure. And let's say, furthermore, that you've traditionally hosted an after-Christmas party for the past 20 years, and many such people have always attended.