Originally Posted by
mkadam68
Maybe he wasn't part of the group ride? Some riders get real angry when other riders jump on their wheel without permission.
This was my first thought as well. OP, are you sure they were part of the ride? Assuming they were, I would (1) avoid him from then on, and (2) warn anyone else who befriended me to stay away from him because he's skittish... within earshot of him if possible.