Is meanness just naturally inborn?  Is it something one learns from others?  Or is it developed according to life experience and/or how one is raised?

Some theories point to one’s experience while in the womb being a determining factor.  Happy pregnancy = happy baby who is good natured and more likely to grow up a well adjusted adult, barring unforeseen circumstances or bad influences.  A mother who has a stressful pregnancy or who experiences emotional trauma while carrying supposedly passes that on to the fetus.  Do you believe that?

When you see a group of children playing, there is invariably one child who is selfish and mean, while another will share freely with others and is happy and kind towards everyone he/she meets.  Is that by learned experience or is it just right there in your DNA?  Is there a “mean gene” that some get, and others don’t? What do you think?