There is enough background for you.
The town is Anti-everything. All people are White, well, kind of. There are very few other races than white. These races include:
and that's it. (like serious. There are three mexican kids in the high school)
So. Back to the hicks. A lot of people live in trailers and they have very few teeth (this is ideal for blowjobs). They also wear camouflage John Deere hats.
HMMMM... What else? Oh yeah! They hate Jews (True story).
They are also not big fans of African Americans. There are zero Black people in Plattsmouth. Deaf people have heard more words than black people are in Plattsmouth.
One notable group whom spawned from Plattsmouth is the KKK. If you guessed that the KKK stands for the Kool Kids Klub, You're dead fucking wrong :DD It's just a bunch of guys who like to dress up as ghosts. It's like cub scouts because you get like badges 'n' shit. BUT ANYWAYS. You know your town is racist when it has a faire called the 'King Korn Karnival'.