essentialize

verb3

1. •
   To reduce (something) to its essence.
2. •
   To misrepresent (something) by oversimplifying a summary of its essence.

   • “This is an essentializing of Hinduism,” Ms. Narayanan said, “and the diversity of Hinduism in India is lost here.” — 2007
3. •
   To misrepresent (a characteristic of something) by falsely portraying it as essential to the whole (that is, implying that it defines the whole's essence).

   • to essentialize race by stereotyping "what Whites do" or "how Blacks think"