I'm quite sure the pinata's would be used in the privacy of the host's home.
Of course the ad copy is upbeat... when was the last time you heard a bunch of women male-bashing, telling stories about "stupid men", or making jokes with castration overtones and not laughing? The entire concept of "grrl power", "strong inddepent women", being a "princess"< "girls just wanna have fun", "rights without reponsibilities", or "stikcing it to the patriarchy" is almost always upbeat... or at least, it is if you've got a vagina.