On my reading, Fay's survey isn't specifically about trad singing. It's about "any form of folk singing activity", so includes community singing (football matches, too, I guess).

And it's quite possible that the wording of the questions about "being a folkie" was intended to cover the pejorative interpretation.

Diane's interest in folk music is higher and wider and qualitative, and, as far as I can see, takes no account of the benefits of participating in singing, or even that singing together (whatever the quality) might be a valid folk activity. Seems a bit elitist to me, but it's obviously what some people prefer.

Kitty