Does she not know how to say "Goodbye"?

All of a sudden I found myself thinking sociologically when we were discussing about culture in class. We were sharing our stories on how two cultures "clash" together. And how hard it is to communicate and interact with other cultures. I remembered the time I "clashed" with a culture. As you probably know, I am hispanic and as a custom in my culture, we greet and say goodbye with a handshake and a kiss on the cheek. So when I was saying goodbye to my cousin's girlfriend, who is white, she thought that I was going to whisper something in her ear because I was getting too close to her.I asked my cousin "Does she not know how to say Goodbye?" I was actually trying to say goodbye but she later found out how to greet and say goodbye to people in my family.

 This reminded me of how much struggle our class went through when we tried to communicate with each other in different cultures. I can only imagine how hard it must be for people who have to interact with other cultures. Such as business people and airline workers. I wonder if cultures count as a group?I hope we get to learn more about how to understand other cultures and how other cultures greet each other.