It's very simple. Men in developed countries are not allowed to "hit women." If it were socially acceptable for a man to "sock a woman in the face" any time she said the n-word, then no white woman would ever say that word. In addition, many black men "openly prefer" to date non-black women. So, black men have given these potty-mouthed white women a "pass" to use that word because they want to get in their pants. Furthermore, black men notoriously fail to protect black women from the non-black people in general. Then to make matters worse, these same black men "bring their white, Latina, Asian, or Arab girlfriends around black women" which only exacerbates the hate & division between black males and females. So, non-black women in general have gained the privilege of using the n-word because black men simply don't care, and because black women are "too powerless" to curry favor with the men of their own race.