What is considered impolite in Central/South American area

In every culture some actions are considered polite, others rude. For example one should not use left hand when interacting with others in India and Arab countries.
Can you please provide some reference what is considered polite/impolite in Ecuador, Cuba, Chile, Argentina and Brazil?
Best Answer
An example of what I found out in Brasil: I was in a restaurant with friends, and my nose was running (spicy food, you know ;) ). In my own country (Holland) the polite thing to do is to blow your nose while facing away from the table. When I did that, I received surprised comments from my friends. Apparantly it was better to just snort it up and blow your nose later, and blowing your nose at the table is considered quite rude. How was I supposed to know?
In general, don't be afraid to make these kind of mistakes. As written above: a smile and a sorry will go a long way, people usually totally understand you are not from where they are. If you have the chance, ask people in a conversation about these things to be a bit more prepared. Otherwise, follow others in what they do and you'll be fine. Embrace the differences!
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Answer 2
In Ecuador greeting with a kiss on the cheek is very common. If you don't kiss them on the cheek or pull away when they try to kiss you its very rude. I know from experience. Its like in America if you don't shake someone's hand that they already extended out to you.
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