This term of being "a real man" ends up being very elusive. Seems like everyone has their own theory of what a man is and how he ought to act. I think that rule nr.1 is to do your own thing and not care what others think. If you abide that rule, you will instinctively laugh when someone tells you something as ridiculous as "you're not a man".
"I live for myself and I answer to nobody" - Steve McQueen
"I live for myself and I answer to nobody" - Steve McQueen