Cultural differnces

Just out of curiosity plus the fact that I plan on traveling to multiple different countries I'm wondering are there any behaviors, activitys or customs that are normal and happen often in America that is considered insulting or disrespectful in other countries?

Also a secondary question are there any similar cases other then America, where one country's belief on what normal behavior is have been insulting to a different culture?

Trust me when I say that America is not perfect but we have or had the largest cultural diversity since like forever.

Which is why depending on where you live you might or might not have inherited behaviors offensive to that or that country.

Hence, OP, Just go and you'll see. If you want to be sure, just hire a guide or find somebody from that country to talk to.
But as long as you don't pull middle fingers every single minute, you shouldn't be in too much trouble.

Anyways, there are a LOT of countries, so, it varies a lot.

I heard that the "okay" and thumbs up are bad in....France and Korea?

nah...they're not.

http://www.cracked.com/article_16335_7-innocent-gestures-that-can-get-you-killed-overseas.html

Good thing I've been practicing eating right-handed...

Not that many would like to go there (don't know why), but never raise your glass to toast in Hungary. Bad history with Austria.