I think Snook gives some good ideas. You guys can see a brief discussion of the troubles with culture differences in the Pimp server (#pimps room). He wasn't being a troll, he was just using dry sarcastic humor. That kind of humor is mostly understood and accepted in American circles, but I can see how it might be perceived differently by people not familiar with it. I have had my own problems with culture differences having lived in Japan for 20 years (and having taught people from all over asia), so I'm pretty familiar with the topic. A disclaimer on your server for people not very familiar with Ph culture might be a useful idea.