I'm sure interacting with Jamaicans doesn't require that much of an education. I'm not looking to act like a local or try to speak patois. However, there are certain things that are good to know. For instance, as several have pointed out, Jamaicans greet with "good afternoon" and "good evening" as a matter of course, and that is considered polite behavior. I didn't know that, and while I'm in the habit of saying "good morning" quite frequently, I rarely do the same in the afternoon or evening - good to know, and something I will make a conscious effort to do in Jamaica. Being genuine and polite is one thing, but there are different ways to interact with people in different parts of the world, and not following their customs can be misinterpreted. Would you have reacted the same way if I was asking about customary behavior if I were travelling to Japan?