In all societies we have ways that we greet each other.  No matter where you live in the world, you have a certain way that you tell someone hello or glad to meet you.  Some do it with a simple handshake while others give hugs.  Some greetings involve just a simple nod.  Who is to say which is the best way to greet someone as long as it’s a greeting.  Different cultures go about it in different ways but no matter what we all manage to figure out a way to communicate with each other.