What might we have done in the early days to generate a more vigorous immune response had we known what was coming?
One thought might have been to call politicians and companies and make sure they understand in no uncertain terms our opposition to this kind of nonsense. Make fun of it sure, but doing so while providing clear, concise breakdowns of what's wrong with the arguments would be another good point.
that old communist bulletin from the 40s makes its rounds every once in a while about mislabeling opponents as NAZIs and bigots, but what if a similar bulletin had made the rounds at the same time among their opponents, warning them exactly how they would try to discredit them?
We should make a list of probably strategies that these parasites will use and suggest effective countermeasures based on our own experiences in gamergate, etc. and pass them onto our Japanese friends through whatever channels we might have.
you have to use a lighter touch in this case. if you go scorched earth, you can ingratiate the feminists to their intended victims, if you ignore them, they'll ingratiate themselves to said victims...
what you can't do is let up, simply because you won a single battle (see gamergate). you have to make sure that those whose ears may bend to them know that they'll lose your support if they bend the knee to feminist demands. Part of the reason feminism got a foothold is they were able to convince those in the institutions they targeted that their detractors were only a small, undesirable proportion of the population, and would simply go along quietly anyway, ie: game companies targeting 'new' demographics while ignoring and disdaining the people who not only bought their games, but in the past, help advertise their games for free.