black-and-white
black-and-white {adj.}
Divided into only two sides that are either right or wrong or good or bad, with nothing in between; thinking or judging everything as either good or bad.
Everything is black-and-white to Bill; if you're not his friend, you are his enemy.
The old man's religion shows his black-and-white thinking; everything is either completely good or completely bad.
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Source: A Dictionary of American Idioms