Like a girl

Sheryl Sandberg on female Leaders
 (Untertitel auf Deutsch  verfügbar)

“Success and likeability are positively correlated for men and negatively for women. When a man is successful, he is liked by both men and women. When a woman is successful, people of both genders like her less.”

And then there´s this ad campaign which raises the question why "like a girl" is an insult.
Which is a very good question.