Thing is that in the 80s and 90s, up to recently, when a female member of the entertainment industry said "no", she would be called a cunt anyway.
Young M probably had a sassy and temperamental way of relating to other people professionally but the whole "cunt" thing is a bit tired now. It understates bad intentions, bad values, bad taste in human behaviour that don't really apply to her in retrospect. Being driven involves breaking some conventions, people will call you a cunt for that. Being a celebrity will make people jealous, they'll call you a cunt.
I'm not minimizing the petty things we all do. We all do petty things. Tell the rain not to drop.