our sins of omission

I saw a middle aged woman hit a middle aged man outside of Costco not long ago. She hit him with her fists on his upper body while calling him stupid. Her English wasn't great, but it was clear what she said. The man didn't hit her back, he just took the abuse. I wonder how much she hits him at home, if that was her treatment of him in public. Had it been a man hitting a woman the police would have been called. And I didn't do anything.