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Palin says she is fighting the 'Old Boys' network. Should the contrast be more to your liking that she be called a 'young girl'?
One can't on the one hand play gender to your advantage as in "She's taking on the 'Old Boys' network" and then balk at being identified as a girl.
There are many instances on sexism in society, but yammering on about any and all references to a woman's gender as an instance of sexism will eventually dilute any reaction to real instances of sexism.