Why is it socially more acceptable for a woman to dress like a man than vice versa?

This got me thinking. Today, I was downtown and I saw this young lady presenting herself as a man. Male streetwear clothes, short boy haircut …it was clear she was presenting outwardly as a man. But nobody even cared. No one looked at her. No dirty looks z

But whenever a guy dresses like a girl, he gets dirty looks from men, women and old people and may even get verbal or physical assaults.