Oddly Wired
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social

You assume a person's current mood is their permanent nature.

The correspondence bias is a common, though not universal, tendency to infer stable personality traits from observed behavior, even when that behavior is driven by the situation.

People rely on this heuristic frequently, but not in every evaluation.

You write a biography for everyone you meet in three seconds.

Where this comes from

Study
Edward Jones and Victor Harris, 1967
What the check found
The definition and source are correct, but the claim incorrectly asserts that this bias occurs in every instance of social judgment, failing to account for known moderators.
Confidence
Solid, with limits

Related

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