Treatment

People treat others differently depending on their relationship with said person. This is completely acceptable in the fact if you talked with your boss the way you speak with your best friend you would most likely be fired in some cases. My question is, At what point do people start to treat others differently? I know the general basis of progressing relationships with people, but at what point do you hold people in higher regard, or expect more out of them? Just food for thought if anyone is hungry.