pigeonholer

/ˈpɪdʒənˌhoʊlər/
noun
  1. A person who places others into fixed categories or types, often in a limiting or unfair way.
    • Don't be a pigeonholer; people are more complex than simple labels.
    • The manager was a pigeonholer who never gave employees a chance to try new roles.
    • The critic was known as a pigeonholer, always labeling artists as one thing or another.
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