Real talk? Yeah, this sounds familiar, at least in the wing of these people who are explicitly Republican/Libertarian and not just apathetic. The only real answer is to keep trying. To actually engage them in explicitly political and also social activity. Boil it down, this effectively means "get them to hang out with you and like-minded people as a group with an explicit political purpose". IE, book clubs (yeah), shooting clubs, etc.

And yes, this is extremely hard in the modern neoliberal conditions of our society. For example, I live miles and miles away from each and every one of my co-workers. And my friends too. We literally have to coordinate every single social event well in advance, and that's not even things that are necessarily political. All because several or all f us will have to drive several dozen fucking miles just to fucking hang out.