I just saw my ex-sister-in-laws for my sons wedding, and although I hadn't thought of it in years my "using the CD/diarrhea to get out of dishes, cleaning, etc." was brought up. It brought back all the old hurt.
The fact is, there's nothing you can do about them believing you or not, you have to remember it's their problem, not yours. They (many people) may never understand. My sister-in-laws asked me if I still have problems "you know, down there, with the bag and all...."
Try to keep a sense of humor about it, and just keep on keeping on.
49 years old, Crohn's Disease
Six resection surgeries, permanent ostomy, adverse reactions to Remicade, back on 6MP for maintenance, hoping for a long remission from this last surgery.