Sorry, I haven't checked this thread in a couple of days. I just consider Mt. Pleasant to be a little above a working class city. It costs a pretty penny to live there. The median price of a home is well above the average for most of South Carolina. I believe that the average home sold for $264,000 in Mount Pleasant in 2003.
Here is a quote out of The Post and Courrier:
"He stressed that everyday public servants, police officers, firefighters and teachers could not afford to buy a house in Mount Pleasant, and he even brought a few to the council meeting to say it themselves. At the time, only one new house under $180,000 was listed on the market"
I think that tells me that Mt Pleasant, and Wando high school are well to do financially. This leads to a "preppy" environment. If the parents have the money, then the kids have the money. From my experiences of when I was in high school, and played against Wando in sports, or attended their school for events, I remember them to be fairly preppy. I guess that is my reason why I said they were preppy.