I understand where you're coming from, Bear. I lived all over growing up, mostly in Europe though. Each country, each region, each culture has it's own ups and downs. One example: Americans do tend to be rude. Japanese are very, very polite. Polite to the point of overdoing it sometimes. When I was visiting my parents there they introduced me to a few Japanese friends they had made. My mom accidentally introduced one of the men by the wrong name; he never corrected her. I would love to be in a more polite society, but I also like being able to correct people if they call me the wrong name!
Another random one: Germans do not eat pizza or French fries as finger foods. Pizza is eaten with a knife and fork, and with fries you get these cute little mini-forks. Since I essentially grew up in Germany (born there, stayed until I was 5 then went back from 9-13ish) I still go by that. Sometimes I eat pizza as a finger food, but I prefer using a knife and fork. At a sit down restaurant I always eat my fries with a fork >.<
Like you said though, be open minded. It doesn't mean you'll like everything, some things you'll probably even hate. But you'll also find the things you love.