I've noticed that in China, foreign teachers of English from Canada tend to be rather conceited about their pronunciation, and dislike Americans more often than not. Maybe they have an inferiority complex caused by their country's close proximity to the USA.
They also seem to be distrustful of their fellow foreign teachers. Sad,really! As for their accents, I wouldn't say they are any better than those of other native speakers of English. In my opinion, humility is certainly not one of their strong points!