Girl, my DB coach gave me a tug of war analogy regarding this when my W was h3ll-bent on D. He said if you let go the rope, the other person will no have to pull anymore. It'll take the focus off you and they may be able to see the relationship with more clarity. "What you resist, persists".
Chances are, he already knows you are not interested one bit in talking about D. You don't have to remind him.