You swim, you fess up. If you don't its the rest of the groups duty to tell the world with as much embellishment as possible. As far as X not swimming and spouting off about it, their time is coming...every day is one day closer to your next swim.
If theirs just two of you and you both swim, I don't know.
"I plan to leisurely advance through my existence" - Terry Fuhrman 1991