Black Person: Because they don't know if you are implying superiority or not. Unless you are extremely familiar with the person and they aren't uncomfortable with you using it, should you use it. I want to add that not all blacks like using the word and some even hate it when other blacks use it. If there really is no need for, don't use and if you know its wrongful to use it, then ignore the blacks that do. They were given the freedom to take the power out of the word, not you. Got it.
White person: But why?
Black person: Well you go and ask a black person 'why?', and we'll see what happens.
White person: But why, I love 'black' people.
Black person: Oh Brother.
2. endearing term between two or more individual to describe a friendship or bond.
2. Chris, you my nigga.