Blue320, I think it's because a proportion of your countrymen who arrive here come with an attitude that it's a given (to them at least) that everyone from everywhere else wants to be just like Americans and do things just as Americans do.
The majority of Americans sit back, keep their mouths shut and see quite quickly that this is not the case. However that noisy proportion of Americans never seem to get it, and continue to behave as if we'd all be doing just like you do everything back in "the States" (a phrase, BTW, that really annoys many not from "the States") if only we could.
Fact is, most of us - and even moreso, the Locals (what nearly everyone here calls the Arabs) - don't want to do things or for things over here to be just like they are in "the States", and because enough Americans who come here never seem to learn this, they create a certain amount of friction and noise that many if not most other newly arrived expatriates do not.
Hence the nasty comments.