"But if you don't like talking about these subjects or the terms in which they are couched, no one is forcing you to do so."

Quite. But that suggests there's a proper way to discuss the subject and rules have been breached whereas Lizzie is usually running along in parallel doing her own thing. I'm not sure what that thing is but it attracts undue amounts of opprobrium.
If history is of no interest to her should she be banished? If I put folk no higher or lower than other musical genres, or aren't fussed about singing old songs because I own recordings of them that are better than I can achieve, or can't be bothered challenging artificial attitudes that have aggregated around certain soungs and their singing should I also be pilloried also?

It's one thing to be proprietorial about favourite tunes but ownership has extended itself across folk as a whole, even to the extent of marshalling the terms by which the discussion takes place it seems. That's neither academically rigorous or particularly cool.