I'm (apparently, or so I'm told) a flaming lefty lib, who recently moved out of the Bay Area to a very "red" part of California. If I limited my friends to only people like me politically, I'd have to be a hermit. I basically take it as given that any new person I strike up a conversation with will not agree with my politics, so I just don't bring it up. Most of my friends got the hint clearly when they brought some of their Trump shit up and I immediately steered the conversation away. We have a good understanding--let's talk about positive things we have in common: hobbies, beer, cars, whatever. Don't bring up politics or religion, and you can make friends with anyone!

Some of them just can't bear to live even a few minutes without talking about their politics at every possible moment, and they're just not friends anymore.