Dave, the secret of how to deal with an OCD-sufferer is to refuse to indulge his OCD.
He may not be psychologically equipped to comprehend "I feel no need to......end of." In my previous post, but I certainly do.

Let him argue with himself, I grew up over fifty years ago, and I've got more wick in my lamp than to allow him to drag me into his playground games. I've actually got a life.