the world's tool...

I think that aside from language you have to take a closer look at the life that has been lead by these specific sub-categorized individuals(ourselves). Prescriptivist and descriptivist; regardless of where you find yourself in this spectrum of speech you cant ignore your past experiences. Who you are and what you've prescribed as yourself within the duration of your life, has a significant impact on how you might perceive the world. You may be a prescriptivist and have had a dramatic experience with a specific minority group, you interpret the situation and explain only within yourself what you've come to learn about that particular event. In the case of prejudice, it really matters about your own interpretation of the world. You could speak within either category and have some form of bias amongst groups of people without ever really considering its presence. So therefore more or less its all about the life you've lived. You could have grown up in the suburbs of Los Angeles in a wealthy family, going to some prestigious school or in the ghetto's of New York, in a desperate community stricken of poverty and have similar prejudice's against a particular group. Its all about your experience in life and how you've come to understand yourself and what the world is. You live within your own boundaries and you speak from them; you can be a prescriptivist or a descriptivist and use the word nigger in the same sense. Or we might say that no matter what combination of words, either singular or in the construct of a sentence, it doesnt matter because its all about the human nature. We have a tendency to act in predictable ways and when talking about correctness or prejudice, neither one essentially exist only because its whats inside that counts most. Your prejudice, I'm prejudice, he speaks correctly, I speak correctly; who's to really judge what is right and wrong? Cultural relativism explains the phenomenon perfectly, we're different, we speak differently and we view the world differently; but we must never forget that we are all still human at fault.