Jewels described black and white thinking pretty well. It's difficult to describe adequately, imo.

Those with Borderline Personality Disorder typically have this personality characteristic. Like me BPD's have a general attitude of all-or-nothing in life. There are no in-betweens. We are firm in our core beliefs. We don't sit on the sidelines in what we believe is good/bad, love/hate, etc. We are animated in our reaction to those things, particularly on the negative side.

For example: I'm having a good day with my daughter, Jill, at a park. Jill remarks that she misses Daddy now, a time when he's at work. BOOM! My interpretation: Jill loves Daddy more than she loves me. Jill doesn't love me. Jill only wants to be with Daddy. Wth am I still doing there? I'm worthless. I hate myself!

A little extreme, yes. But that's black and white thinking, all or nothing, BPD.