Dr Laura and the "N" word

Had an interesting conversation with Larry about Dr Laura's use of the "N" word during her radio broadcast last week and the subsequent reaction. He says that he hates the double standard - if black people can use that word, why can't whites? And I said:

1) because white people tend to use it as an insult, while blacks use it affectionately toward each other, and, even if they use it as an insult, it's still their word

2) because blacks are the only ethnic group in America that came here unwillingly and since they were dragged here in chains for 400 years, they get exclusive use of that word forever and whites have to get over it!