<human>: I've always heard about Americans going overseas and doing something that is considered rude in another culture. Like in muslim countries you are are not supposed to show the soles of your feet. Or keeping your hands in your pockets is supposed to be rude in Turkey.

I'm American and I was trying to think of something that a foreigner might unintentionally do that would just totally offend me. And I just can't think of anything. Even if there was something, it seems like I could easily overlook it because I would assume they didn't know any better. 

I suppose it is possible that a foreigner could do something like stick up his/her middle finger and I might take that as in insult, but that's something they'd really have to do intentionally and with emphasis to really communicate an insult.  I can't really imagine someone giving me the finger unintended.

Can you give me the gist of the text in a nutshell?
<bot>: Is there anything that a foreigner has done that offended you? And if so, did it occur to you that they just didn't know any better? Does that even make any difference to you?