The Fifth Social Style

I fondly remember
A couple I know
Arguing about their
Respective
Social styles.
They were each
As amiable as could be
Until it came
To dealing
With each other.
They were so cute,
Like a couple turtles
Debating which one
Was thicker shelled,
Or more hard headed
Than the other.
They bantered
And badgered
Back and forth
Until I concluded
There is a fifth social style,
That of a belligerent amiable!