I get a little irritated with the implied suggestion that "it's too difficult, so I needn't bother".

Singing isn't easy, especially in public, but if you're going to do it you should do it properly. Folk singing doesn't require a perfect voice, or even very much in the way of performing skills, but it should it least involve singing in tune and remembering the words. To do that requires work and effort. I'm afraid I get the impression that some people aren't prepared to put that work and effort in.

No one is surprised that it may take years of study and practice before someone is sufficiently proficient on a musical instrument to play it in public. Why then should singing be any different?