How old were you when you discovered there was a war between the sexes?

I'll be truthful. I was damn near 40 before i discovered this was a thing. Sure i knew both genders had their proclivities. But until that time i never knew there were actually women that went out of their way just to screw with men's lives and minds. At what age did you learn about this of the opposite gender. Did that change the way you viewed them at all? How did it change it?

How old were you when you discovered there was a war between the sexes?
Post Opinion