no, Al has a right to challenge the folk establishment, and state his opinions.
to some extent he is right, folk music is not the music of the working class, that does not mean that there are not some working class people who like it, but the vast majority of the people to who it appeals are the sort of people who like art music [and most of those are middle class], that is what most of it is . folk music as we know it and how it is categorised is really art music.
in my opinion,in the last 40 years the uk folk revival has become more like the commercial pop world, this has been as a result of a mistaken belief that folk music has to be mainstream, what generally happens when something becomes commercialised in an attempt to make it mainstream, is that it can change its character and lose some of its original qualities and lose   its closeness to its roots.