Even seen or read "A Boy and His Dog"? That might be a starting point, holding the remaining men captive for purposes of procreation, their sexual pleasure a non-issue.
While there will be gaps in capability and technology, I have no doubt we would quickly produce female workers who can do the jobs once performed by men. After all, women in STEM are deterred by social aspects--male classmates and instructors making them feel unwelcome and/or unable to compete--so absent that pressure, plenty of females will thrive in STEM fields of study, becoming as able as the men who are no more.
I can't agree that women in groups are all "mean girls." Without reason to compete for male attention, women are likely to become far more collaborative and supportive.
One huge difference will be that in a world where all the nations' leaders are women, there will be a *lot* less war. The resources that once went toward the military and was can be repurposed to things the world will benefit from, like alternate energy sources, eliminating world hunger, clean manufacturing and shipping, etc.