That's the first statement always provided when someone points out something bad done by a man in society.

"Real men don't do that" or "he's not a real man"

But the guy who did something horrid is a man though. So what is a real man then...? Why is it even a response used. I get that no one what's to be grouped in with someone who does something bad but the statement doesn't really make sense. Why wouldn't they just say he's not a good man then or a gentleman like what men from older time periods did. Where did this real man rhetoric come from