the view held in some quarters that the only people who should be performing "tradarts" in public are professionals and that the folk scene exists as an environment for professionals to make a living out of
*sigh* I don't know if this misapprehension is wilful, but no-one has remotely suggested that. There is a world of difference between the noun and the adjective. A professional performance, as opposed to a professional performer, if you will. It's fine te bo amateur, but not amateurish.
Have the good grace to do justice to the material and the tradition, rather than insult it with an unrehearsed and dire rendition in public. Rehearse, practise, refine and polish - and then perform. That's all it means.
The more crap performers there are inflicting their nasal bleatings, stumblings and fumblings on the public, the more Parris's snide remarks will find a billet.