My Man Throws a Hissy When He's Emotional

why do men (namely mine) so closely mimic the behavior of small children - selfish, volatile, and completely out of control of their own actions when they get emotional?

You're a grown man, honey, not a small child
But when you don't get your way, you go wild
You're too old for a hissy
Every time you feel pissy
Keep this up, baby, and I won't stay beguiled

Lovers to Whom You Give Your Soul Who Later Turn Into Jackasses

This haiku is for you, J (and probably many others)

You said you loved me
You lying sack of pig shit
Better men want me.