Pessimist vs Optimist

Does a positive not ride "shotgun" with a negative, or vice-versa?

But what about them "Realists" 

Optimist: The glass is half full
Pessimist: The glass is half empty
...
Realist: The glass is actually twice the size it needs to be.

This is simple.

You're to be who you wish to be, not to be scared of another opinion.
With one comes others.. People will follow, and in relation to this... We are but not one of the above. We're a little bit of each.