A 'man child' is often defined as a grown man with the emotional/mental maturity of a child. While it's sad to think that not all boys grow up to be men, knowing how to tell them apart could potentially save you from having to deal with a lot of stress, heartache and pain.

The Man Child seeks domination, as they equate masculinity with the strength that comes from feeling superior to others. And the only way for them to feel more superior is by constantly putting others around them down.
Real Men know that the measure of one’s strength isn’t in comparison to another’s weakness. As long as everyone is respected as an individual, it really doesn’t matter to them who wears the pants in the relationship. And they are willing to be taken care of when they know they need to be.

The Man Child always insists on getting his way, even if this means manipulating others.
Real Men understand the importance of compromise, and they have no time for playing games that keep people questioning their motives.

The Man Child is never keen on learning new things because he always assumes that he already "knows everything".
Real Men can admit when they don't know all the answers, and are always eager to learn something new about the world around them.

The Man Child will not hesitate to point out other people's flaws (especially strangers), while being completely oblivious to their own.
Real Men will not tolerate with being disrespected, but will also not tolerate those who constantly disrespect others.

The Man Child hates feeling vulnerable, and is often referred to as being "emotionally unavailable."
Real Men know when to be vulnerable to the things that really matter, because to them, that is a real measure of strength.

The Man Child loves playing the victim whenever things go wrong, and always has a back up plan for weaseling his way out responsibilities. And that's because the only person he ever looks out for is himself and his own needs.
Real Men will not hesitate to apologize when they’re wrong, and they will stand their ground when they’re not.

The Man Child only views females (his mom, his aunt, the woman he dates) as a way to fill some kind of void in his life. This distracts him from having to face the reality that he really is not willing to learn, adapt to changes, take on real life responsibilities or grow.
Real Men are self-assured, and do not need to use women in order to feel more secure about themselves.

But at the end of the day, the biggest thing that distinguishes a man child from a real man is this...

The Man Child will always feel the need to prove to themselves that they are “real men.”
Real Men already know there really isn’t anything to prove. And that's because no one man is more “real” than the next. They already know who they are, and do not dwell on what others think of them.