What I don't get, Challis, is how you can say "Norma can't SING" is a purely objective statement. It is, of course, a purely _subjective_ statement (Did you just make a typo?)
If you don't like Norma's singing, you probably would like people such as Walter Pardon, Harry Cox, and Queen Caroline Hughes even less. But to Norma, Martin Carthy, and me (among others), these people are among the greatest singers ever. It's really just a matter of taste. So while I don't get upset, I figure you don't hear what I hear in Norma's singing, and I don't hear what you hear in June Tabor's.
By the way, I think one reason people might get upset is that you don't say "I don't like Norma's singing," you say "Norma Can't Sing" as though you were the arbiter of who can sing and who can't. Kind of relegates the rest of us to the position of dummies who haven't seen through Norma's trickery. Well, we ain't.