I don't have a Borg spouse, but I do have Borg parents, one of whom is an Elder. I know it isn't the same thing, but I can understand the feelings. It feels good to be free to choose one's own life, but when those close to you hate what you've chosen...
Personally, I try to keep the conversations about doctrine low key. Problems arise however when I jab their beliefs about the world. Example of a discussion/argument: I'll challenge their claims that everyone in the world is a miserable selfish sinner. They'll get ruffled and usually say something like "Well... you're just a foolish young man who doesn't know about real life!" That's an exact quote by the way. My standard response: "How can you know what real life is like? You've never lived a normal life or been close to anyone or anything outside the truth!" Answer: We don't need to see for ourselves, we just know!" Inspiring words, no?