Here is the discussion on rec.music.folk to which Jack Campin refers.

You'll see that the discussion consists of three entries:
1) Greg Austin's caustic message, complete with typos and apparently bogus credentials;
2) Mark Moss's erudite response which includes the statement that "representatives from the NFB and the NABM have explicitly stated that Austin does *not* represent either organization, isn't even a member, and that they *never* had any intention or interest in calling for this boycott"; and
3) Jack Campin's whinging about the Sing Out! website, along with a meritless assumption that "Greg's right" based solely on Jack's impression of the website design, which has nothing to do with Greg's complaint!

Mr. Moss is the only one who's making sense here. To paraphrase his advice given earlier in this thread, double-check and verify the information given in hate-speech posts before jumping on the vitriol bandwagon.