Seminar paper from the year 2012 in the subject American Studies - Linguistics, grade: 2,3, University of Potsdam, language: English, abstract: In which way and why is there a difference in pronunciation between male and female speakers of Southern American English?
When researching Southern American English, it becomes quite obvious, that there is no common and typical standard Southern pronunciation and thus the quote seems to be valid. Nevertheless one can determine certain overall pronunciation features when listening to speakers of Southern American English.

"Southern American English pronunciation differs from region to region, even from person to person, because speakers from different circumstances in and different parts of the United States commonly employ regional and social features to some extent even in formal situations", William A. Kretzschmar Junior proclaimed in the Mouton textbook of Varieties of English (In: Schneider, 2008, p. 37).