I'll start...
(I owe a reply to Phillies haters ;))
“You should not hit a girl or a woman.”
This is fine, of course, until you remember that if a girl hits a boy, that’s okay and brave and strong. Also, “Men can not be abused.” 40% of domestic abuse cases are suffered by men. Now, if 1 in 3 women are abused, and 51% of the world are female, and the world has 7 billion people, a lot of people, men included, are being abused.
I apologise, I originally had the numbers but it turns out I’m actually awful at maths so if someone knows the number, please feel free to tell in the comments.