Yes, everyone knows that Americans have terrible reputations for rude behavior around the world--got it. I think you should do a similar article regarding what's considered rude by Americans when others visit the US. Here are just a few:
1.) Thinking you can walk into a store and barter. unless an item is damaged or discontinued the price marked is the price. I work in retail and people from Asia or India will ask me to check the price on an item and then tell me, "Oh no--that's too much. I'll give you "X-Y-Z" for that." No, the price I gave you IS the price.
2.) Criticizing the city you're in for not being like where You come from. I live in Chicago. In the winter, its VERY cold and windy and the summers are hot, humid and windy. There's nothing anyone can do about that. Our mass transit might not be on par with Europe or Asia but we're doing the best we can with the resources we're given. Yes, parts of our cities are dirty and the walls are laced with graffiti. Just know that we don't have people thrown in jail or flogged for littering.
3.) Have an elementary working knowledge of English. Unlike many other countries we speak only English or Spanish generally speaking. My Spanish is passable. Know that coming here because if you don't have a command of the English language, an interpreter is not going to be provided. FOOTNOTE: the exception is in the bigger cities. In Chicago there are large Asian, Arabic, Polish and Czech communities where you may be able to find someone who you can communicate with.
4.) Social Status. In this country, women are treated with respect and as equals. We have the vote, we work and earn our own money as well as pay taxes. Anyone visiting the states from a country where women don't have any status should know this. I had a couple of big burly men from a middle eastern country come into the store where I was working and tried to treat me like a servant. That kind of thing doesn't fly here.