"Then there's the trappings: the attitude, the clothes, the mannerisms."

What have clothes got to do with it, 'glueman'? Nobody I know dresses in any particular way to sing trad. songs. Leaving the 'not very funny' in-jokes about trousers aside, you seem to be setting up 'straw men' again.

And please translate the following passage:

" ... by conflating old songs with a wider pop-cultural stance I know as grump, the artsy-crafty-beery folk police thing."

I genuinely have no idea what it means! What the hell is a, "wider pop-cultural stance"?