This may be a really bad suggestion, but what would happen if you shared deeply private information about HIM? I guess that would just make you look bad... but how would he feel if you started sharing information about how long he takes in the bathroom or how he's starting to forget stuff and get a little shaky as he's getting older?

Actually, does he realize how bad this makes *him* look? If someone I don't know all that well starts sharing extremely private information about another person, I start to think poorly of the person doing the talking. I do not assume that what they are telling me is true.