One of my dearest friends and drinking buddies is a Trumpster. We have a great time when we get together, absolutely freakin' guaranteed. How do we do it? Both of us are intelligent and thoughtful and respectful enough to listen, either find points of agreement or discuss other things. Our lives are not consumed by this ugly stuff.
And really, I don't even know if intelligence has anything to do with it. It's just about how you choose to treat people in real life. Appreciate the stuff you like about them. Realize that we all have our own experiences, perspectives and priorities. It doesn't need to be all that tough. The Golden Rule, and all.