If you don't like the session, don't go to it. It's as simple as that. I personally don't like whinging blues sessions, and I don't go to them. Not very fond of music hall stuff, so I avoid that. Don't like hopping about, so no dances either.

A good session is inclusive, in that it's open to other people who come along. But don't expect an Irish session to be accommodating to a Bavarian oompah fanatic who brings his tuba along and expects everyone to join him playing Yodelayeehee for the rest of the evening. (they might well be happy with one set, though). Just as I wouldn't expect to be particularly welcome if I decided to play mediaeval bagpipes in a shanty session.