No problem. The whole regional stereotyping thing in China is fascinating to me too. Especially in understanding where the stereotypes come from. Folks from Dongbei (the northwest area, also known as Manchuria) are stereotypically rural idiots. So you regularly see Dongbei accents used by comedians, the same way that a heavy Southern drawl made comedians like Larry the Cable Guy (actually from Nebraska) popular.
Cantonese have two main stereotypes: that they will eat ANYTHING (this is mostly true), and that they all want to be pop stars. True, for a long time Guangzhou was the pop-cultural hub of China and most pop-stars were from that region. So if you go sing karaoke, you try to put on a Cantonese accent. Which is really tricky, because the accent comes from Cantonese speaking...well, Cantonese instead of Mandarin. And IMHO, Cantonese is one of the most unpalatable-sounding languages imaginable. To me, it sounds like a warbling duck with major flatulence issues, because there's all these glottal consonants and a crazy number of tones. Good for comedies, hard to watch a Cantonese-language epic drama.
It's really interesting when you start looking at American movies and see the same sort of thing going on that you never noticed before. Like if you want a blue-collar cop, you give him a Boston or New York accent. If you want a white-collar cop, he's gonna have a Southern California accent or no accent at all. If a character has a Southern drawl, there's a narrow set of archetypes they're gonna be. If they have a "surfer" accent, they're probably stoned and moronic. If they have an upper Midwest accent, they're bright, friendly, naive and dumb as a brick. (Fargo being a movie that played with this beautifully...)