@Erythronium Do you have a son/sons at Eton? If not, how do you know that the school "literally trains boys to rule"?
I can sort of see what you're getting at. However, the school also teaches boys that they are absolutely fine, whoever they are, and whatever they do. If they love English and write poetry in their spare time, that's celebrated. If they are Maths geeks, that's celebrated. If they want to be Prime Minster, that's celebrated.
The greatest thing about the school is that all the boys who are there are valued for being, well, who they are. Without any of the sexist crap attached to being male (namely: you have to be good at/like Science and sport, because Arts subjects are for girls. And so on).
It's also worth mentioning that the boys themselves are responsible for the societies - there's no list of teacher-devised 'activities' which might just include a feminist society. If there's a society, it's because the boys are genuinely interested enough to start it themselves. The speakers are pretty good, too.