jim.
diction is part of singing, singing is about communicating, audiences have to be able[amongst other things] to understand words
so diction comes under the category of helping singers by giving positve criticism .
i have stated a couple of times that criticism should be given in private and when asked for, it should also in my opinion, be given in a diplomatic manner, so find something good about the persons perfomance, mention it first, then come up with constructive criticism.
   i fail to see how the above comments can be construed as arrogant.
comments denigrating my charcter [ by reputation not a nice character], from people I have never met tell people more about the character of the people who make the comments.
incidentally I met MacColl on a number of occasions, on the first occasion i found him to be extremely arrogant and rude, I think he was a fine songwriter, and a good singer, although there are a number of revival singers who I would prefer to listen to, and a number of tradtional singers larner cox, bob lewis, who in my opinion are better