Theseus fighting Prokrustes. Surround of the tondo of an Attic red-figured kylix, ca. 440-430 BC. Said to be from Vulci.

Stereotypes are a Procrustean bed. Once established, individuals are pressured to conform to a group mean.

Very few people are content to let outliers be: either they try to explain why the refractory datapoint isn’t really an outlier, or argue that it was never really part of the group under consideration (the No True Scotsman maneuver).