<I'd like to add a brief comment to this spirited discussion, because I feel that some of the statements made are starting to take for granted that the only people teaching English are those in non-English-speaking lands and cultures. >
I think you'll find that ESL and the word "intranational" have been used here.
<For many of us, that is actually even part of our official job description. I don't feel that very many of us are likely to need the kinds of lectures on cultural sensitivity that I have read here, as it's our stock in trade. >
OK, fair enough, but please remind me again of your advice to David, the topic starter.