Why are women so stupid?

Nature or nurture?  The fishhole?  The Internets?  Smaller brains?  Why the fuck are women so fucking stupid?

I generally find it is because women lack drive.
Face it, men outnumber women, lesbians outnumber gays.
By the numbers alone, even if you don't bother you could get laid anytime you want, if you're a woman.
Since the whole point is to have children and pass on the genes to the next generation, and that is all too possible when you're a woman, then why bother exerting yourself to aim higher?
As a woman, you can take it easy, live in a childish world and never gain any responsibility.
Of course, that's my experience.
There is also the physical maturity of the human brain.
Human male mental maturity grows at a steady pace, where it flatlines around 18 years of age.
Human female mental maturity flatlines when the girl hits puberty, where the hormones concentrate on the reproductive organs over other areas.  After the bulk of puberty is dealt with, the female brain will then continue its path of mental maturity, before a final flatline around the age of 21.
That's right, if you're a man and you failed highschool, you're screwed.  But if you're a girl and failed highschool, get your GED and go on to post-secondary, because you still have room to learn.
This explains why men do better in highschool compared to women, but the field evens out again in university.