IPA: /ˈstɛr.i.oʊˌtaɪ.pər/
KK: /ˈstɛrɪəˌtaɪpər/
A person who makes generalizations about a group of people, often based on limited information or assumptions.
She is often seen as a stereotyper because she makes quick judgments about others based on their appearance.
Stereotyper → It is formed from "stereo-" (from Greek "stereos", meaning solid or three-dimensional) and "-type" (from Greek "typos", meaning impression or model). The word refers to someone who creates a solid or fixed impression of a person or group based on oversimplified characteristics.
Think of 'solid' ('stereo-') impressions or models ('-type') that people create about others — that's why a stereotyper is someone who forms fixed ideas about others.