By definition anybody who posts on the Mudcat is going to be interested in folk music.

Most are "white", I imagine, probably disproportionately so (I mean most people in England/Australia/the USA are "white" , and those are the kind of places where most Mudcatters are, it appears, so you'd expect a sizeable majority of "white" people in any case.) So they aren't going to have much direct knowledge of the reasons why their "black" contemporaries might not be into the same kinds of folk music.

And "black" Mudcatters aren't necessarily going to have much more to contribute on this, since they are into the music themselves or they wouldn't be here.

Though of course there might be black Mudcatters people who don't feel comfortable in folk venues, but who are comfortable on the Mudcat. If so, it would be interesting to hear from them. They might be able to say if there are any things about the folk venues which have made them feel out of place, over and above the fact maybe that there might not be many black faces around in those places.