Hi PRS Member (I am too, by the way); answering your questions in order:

No, not everyone, not even most - in my experience.

Not true - see above - and the discussion on this thread proves it. How are Victorians made by the way? :-)

Again, no; I was never made to feel ashamed of my songwriting, nor have scores of songwriters I can mention; Indeed next week two clubs in my area, Maidenhead and Banbury are running songwriting competitions!

No - I don't think that is what folkies secretly believe.

In answering the above I speak for myself, of course, but I know many who would agree with me.