Doesn't matter what someone "is". Slurs are slurs. Really don't see how calling someone a "cunt" is any better than using the n-slur or f-slur. (Except apparently those are censored here but "cunt" so I guess AP.net is okay with sexism, just as long as it isn't racist or homophobic sexism)
The n/f slurs are offensive/used towards certain groups of people. Cunt can apply to anyone.
And Courtney Love is definitely a cunt.