I think Eric Bischoff, and others', stigma about being "too southern" might stem from people equating lack of intelligence and other unappealing qualities to a southern accent. This crop of talent on the WWE's main roster may have the most diverse set of english accents, like newscasters the talent develop a neutral accent.
Granted, I only have 6 years of wrestling watching under my belt but I'd believe there to be a regional bias in US wrestling talk.