Wow, Eric, that is the most thorough explanation that anyone could have wished for and I hadn't realise that there were so many implications to la glottophobie!
But I did see Mélenchon, around the time of the general election, taking questions from journalists and pretending to not understand a question from a woman with a SW accent and then, to compound his error, asking for a question from someone who spoke French!
He was roundly condemned in the press for it but I guess he is just as arrogant as any other politician?
I myself have to be very careful how I pronounce words with "en"
(as in mentir
!) because around these parts, many people say it differently to the regular accent parisien
N'allez pas trop vite - Proust