I agree with CaverDan. Its pretty seldom that us older folks give a crap about whether the person we're boating with is from the Front Range or them thar hills. After a while you realize that no matter where they're from, the spectrum ranges from real pricks to great folks. The key is to avoid the pricks and surround yourself with folks that have good attitudes.
Also, its not like the "city slickers" we meet here on the river are some kind of stereotypical Noo Joisey types. I've found that folks from the Northeastern concrete jungle I meet on the river, or slopes, are usually trying to get AWAY from that city slicker mentality.
A person's attitude is what's most important. If you've got good attitude, it doesn't matter where you're from.
...unless you're from Texas.