I don't think we actually disagree here, except about linguistics. I'm not saying there's no objective difference, I'm objecting to the arbitrary use of a word that blurs the difference, and lends a spurious objectivity to dubious personal tastes.

If I'm making an unfavourable comparison between PPM and Leadbelly - and I would be if the matter arose - it'd be on the basis of the aspects about they treated their songs. "And I found it twee" might be a valid comment to add, but only as an indication of personal taste. If I was talking about PPM that would indicate that my personal tastes were reasonable enough; if I was talking about Peter Bellamy, on the other hand...