I'm genuinely confused why you're breaking it down into console generations? I mean are games more sexist because Microsoft and Sony switched to x86 processors? Seriously... you could say over the last decade there's been a greater attempt to tell stories in different ways and that has lead to creative works that some would find offensive or whatever. But I mean saying the discussion didn't happen during the last (sixth) generation ... I mean what?
These new consoles are literally a year old, it's not like discussions about feminism and sexism started November 2013. Gamers (can I still say that?) are obsessed with breaking things down into managable chunks. There's grey areas here too.
Also this who casual market thing is odd. These are people too right. They have their owne established values and aren't fumbling their way onto expensive new consoles then turning around and saying 'These games are sexist!'. The vast majority of games don't post on forums or engage like this... in fact most just play games and that's it.
And frankly people should be more critical of the sources of these discussions. Games are absoluelty going through a cultural transition, but there's a lot of misplace chivalry going on too. And it's also possible to find Anita Sarkeesian's video ill-informed and poorly reasoned (not to mention featuring plagiarised works) and still think that sexism in games is an issue.
tl;dr Games have had sexism issues long before the launch of the Xbox One/PS4.