I find there's a lot of material describing this phenomenon but not much on how to overcome it. I'm particularly interested in it as it applies to weight, as i am a 'feast or famine' thinker on this topic.

[-jimi-]

I thought I was a black/white thinker until I met a new friend. She has her world so split up I imagine it would be hard for her to function at all.

I try to not be so much an all or nothing person, but it is hard. I don't have BPD but I still think like this very much.

I'm like this with everything in life, it's not just with people.

[jeremiahgirl]

I use to be as well, only under extreme stress does this "demon" rise up. After therapy with the use of EMDR was I able to realize there is a gray area.
Learning DBT also helped in understanding the extreme thinking wasn't healthy.

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[Pastel Kitten]

I struggle with this too. Wish I knew what to suggest, but I've only recently started DBT so hopefully I'll learn to combat it.

As cliche as it might be, I think the act of recognizing that you are viewing something as black or white can be helpful. Like telling yourself, "I am using black and white thinking right now. I know that is not always healthy." I am definitely working on this challenge as well.