Jeff started messing with the stats.
He dialed up the global female population to 90%. His chances of getting laid went up with so many extra women around.
A window popped up with women's stats and Jeff made more changes. He set it so that when women turned 18 their brains turned to mush and leaked out of their ears. They wouldn't be vegetables but they wouldn't be able to do anything complicated without someone helping them. He made it so women liked being so stupid and being treated like the idiots.
Jeff was about to execute the changes when something occurred to him. Being in a world full of brainless women might have some downsides like having to babysit them 24/7 or worse no internet.
So he made it so 10% of women were geniuses and that they ran the entire world. In fact they ran it so well no one else even needed to do any actual work.
Jeff executed the changes and the Chrinvisc changed the world.