Shouldnt our primary intent be to communicate? As long as I can understand a post without too much difficulty, I dont care if the author uses American, or the kings English or any other variant. If spelling or grammar is a bit off, so what? If the author uses slang, or reasonable shortcuts, or smileys, its all good, as long as we communicate.
Not everyone on this board has a form of English as their primary language, and the board is richer as a result. Lets encourage participation rather than intimidate by suggesting one form is better than another.
btw, how arrogant is it of we Americans to usurp the word American as if it only applies to us in the United States? Folks from Canada to Chile and Argentina live in the Americas. Therefore arent they also Americans? The problem is that I dont know a good alternative term for citizens/residents of the United States of America. United Statesians just doesnt seem to cut it. Ill bet the stralians have a few choice alternatives.