JNugent wrote:
Nope, dialects are different.

Indeed they are and this affectation is NOT a dialect.

It may not be a dialect, but I'm not sure that there's
any indication it's an affectation either:

affectation: speech or conduct not natural to oneself :
an unnatural form of behavior meant especially to
impress others.

However annoying you might find it, if it is a natural part
of the way they happen to speak, and not one chosen deliberately
by them, it isn't an affectation.

#Paul