My suspicion is that it is based largely upon context. I would postulate that academia and journalism are still pretty sexist compared to the 'tens of business

My suspicion is that it is based largely upon context. I would postulate that academia and journalism are still pretty sexist compared to the 'tens of businesses' you observed. Potentially in support of your perspective: I see the overspeaking roles inverted in the context of reality TV shows, though that could potentially be seen as a counter-action to normal social roles which develops as structure of society is removed... which would imply the sexist paradigm is the prevalent one.