Chet, is the jam supposed to be open? I was at a jam and my friend who had brought me did mention etiquette. But he was referring to not playing, say, a rhythnm instrument if someone was already doing so (or something to that effect). It seemed fair to me. But your description sounds like snobbery to me. I suppose if I was one of the ones who didn't like guitar as rhythm, I might try to come to an agreement about when and where we play.......but not so nastily.

Margarita