The only way to start bridging this division is to keep in mind that they're people too. I'd even argue against calling Trump Voters strictly shitty, hateful people (though truly shitty, hateful people are among them). More often than not, they're scared, hurt people. They're people who have been convinced that if they don't defend themselves and their neighbours, the "other" will come for them.
Never forget that these people all genuinely believe that what they are doing is right. Attempting to dismiss and demean them is only going to further validate that they are right and you are the enemy. We need them to see the right-wing brain rot that has wormed it's way into the hopes and fears for what it is, and we'll never get there through further division and demonization.
Fuckin' preach. It's easy to see that it's all shadows on the wall once you're out of the cave. That doesn't make the people chained up inside any less intelligent or human. There's something else keeping them there, and it's hard to be convinced that something you've lived with your entire life is chaining you down.
The "they called me racist, so now I'm going to hate immigrants harder!" memes are both more real and more damaging than anyone, self-included, realized.