manner factor
Have you ever thought manners that you make might get someone or someone else anger. My experiences showed that not only have many countries different culture, but also they have many specific manners. For instance, I am Thai and now I have been living in the US. The apparent event is different greeting. American people always say something to each other even they do not know each other. It sometimes makes you feel irritated so it is evident that the different manners may make you get upset. First of all, native of a specific manner in each country is different.