"I like Folk as Flotsam* because, although a traddy, I like people - everyday people, coming to a folk club after a hard day's work in the fields (or on the cabs, the Job Centre, the hospital, the school, the building site, the ministry, or computer terminal) to sink a few pints and sing whatever they want to sing without someone telling them it isn't folk."

I don't think anyone would object to people getting together to sing whatever they like. What people are questioning is whether what you describe should be described as a folk club.

If I go to a jazz club, I expect to hear jazz. If I go to a Mozart concert, I expect to hear Mozart. Is it unreasonable to expect to hear folk music at a folk club?

What you are describing may be a very enjoyable way to spend an evening, but calling it a folk club is misleading.