'a hardcore of fundamentalist folkies (Arran jumper, personal pewter tankard, finger in ear) to whom anything new and different is anathema, frowned upon and dismissed.....'

For those who don't believe these still exist, visit Whitby (UK)during festival time or some of the surrounding folk clubs. Personal tankards dangling from belts using little hangers tailor made for the purpose. However, most of these people are 'getting on' and are the founders of the folk world we enjoy today. Not to my taste but I respect their views and ways - they probably dislike my 'modern' versions but are too polite to say!
They also add greatly to the 'olde worlde' atmosphere of Whitby and is why thousands of tourists visit every day!

Live and let live - we are all FOLKIES!!