Update: Keri and I "confronted" the guy who started it all, and he admited I had nothing to do with the rumor he started, and that he was to blame. He admitted his mistake and apologized. However, the guy he talked to is still convinced the rumor is true.
That said, nobody in the club believes the rumor, and a number of them have come down on this "believer" pretty hard. They guy is stubborn and won't change his mind, but it's clear nobody is in camp. In fact, they've all lost any credibility in him now.
So, in the end, the guy is just digging himself into a hole deeper and deeper while my reputation has been kept in-tact.
It's just disappointing it had to happen at all. I thought better of my fellow club members. Lesson learned.