I run into the same kind of thing with some friends. They have this undying faith in the Republican party and are always talking about how terrible the democrats are even though they are not necessaily that conservative. Some don't even like Trump, but they just seem conditioned to identify as Republican. I don't think you can persuade people politically, at least not directly, because it's like a religion with some people. You just have to hope they can eventually figure it out on their own.