I have friends across the political spectrum, but these days there is no shared commonality at all. Not just no commonality about what's good and bad, but no commonality about what is reality and what isn't. I can't even chit-chat small-talk with my conservative friends about current events anymore, because their idea of what is happening around the world is totally different than mine. I'll bring up some recent event that was reported on widely in the mainstream media, and he'll have no idea what I'm talking about because his sources of news never even mentioned it. And to his point of view, talking to me just shows I have a different set of gaping "reality blind spots".
If you ever had a friend growing up whose family was devoutly religious, you might have seen something similar: They run in totally different circles, all their friends are from their church, they take their kids to totally different movies, listen to totally different music. Can't talk sports with them because they literally can't name a football team. No culture overlap at all. Totally siloed off in their own world. That's what's happening with all this personalization and alternative news sources now, but instead of a small group of very religious people, it's 30-40% of the country!