It implies a lack of nuance or understanding of complexity, and a tendency to oversimplify. It can be used to describe someone who is:
* Judgmental: They quickly categorize people or situations as good or bad without considering all the factors involved.
* Inflexible: They are unwilling to compromise or see different perspectives.
* Uncompromising: They stick to their own views and refuse to listen to others.
* Unrealistic: They fail to acknowledge the complexities of the real world.
Example: "He sees the world in black and white – he thinks everyone who disagrees with him is wrong."
The opposite of seeing things in black and white is seeing things in shades of gray. This means acknowledging the complexities of situations and understanding that things are rarely completely good or bad.