From csmonitor.com: Québecois: maligned accent may have its roots in royal courts.
Québec’s francophones have long been ridiculed by the Parisian French – the scholars, elites, and aesthetes from the ancestral homeland. They have deemed the Québecois accent an "abomination" of what they consider the most beautiful language.
They shouldn’t sneer.
The Québeckers’ much-maligned accent can be traced back to the 17th-century court of Louis XIV. At least that’s the argument put forth by a prominent Québec scholar, Laval University’s Jean-Denis Gendron, a retired linguist. "The Québecois accent is one from the noblesse of the time, it is a relaxed, natural accent," Professor Gendron, explains in the most recent issue of the journal, Québec Sciences. "It’s only much later that our accent came to be viewed as an abomination." [continue].