Oddly Wired
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social dynamics

You see your group as diverse but others uniform.

A 1980 study by Quattrone and Jones titled 'The Perception of Variability Within and Across Groups' found that individuals perceive out-groups as more homogeneous than in-groups.

The original claim misidentifies the title of the academic paper by Quattrone and Jones (1980).

You project simplicity onto people you do not know.

Where this comes from

Study
Quattrone and Jones (1980), Out-group Homogeneity
What the check found
The study and authors are correct, but the title provided is the name of the psychological effect, not the paper itself. The claim is directionally accurate but misattributes the source title.
Confidence
Solid, with limits
social dynamicsbiasgroup psychology

Related

One of these every day, and every one names the study it came from. When a finding is contested, it says so.