I'm willing to bet that I run across more inconsiderate powerboaters in a single weekend on the Chesapeake than you'd meet in a season in SC waters. South Carolinanian's would have to work pretty hard at it to equal the level of rudeness I see, personally experience and hear on the VHF.
As a SC native, I feel certain you're less likely experience rudeness there than many other areas of the country.
s/v Palmetto Moon
1991 Catalina 36