This is a concept coined by Sigmund Freud, (der Narzissmus der kleinen Differenzen), its the idea that communities with adjoining territories and close relationships are especially likely to engage in feuds and mutual ridicule because of hypersensitivity to details of differentiation…
I have quite a soft spot for Sigmund Freud. I think he is sometimes quite unfairly maligned and typecast for his psychoanalysis theory while the rest of his body of work is ignored or down voted (for lack of a better term).
“In numerous cases of apparently ethno-nationalist conflict, the deepest hatreds are manifested between people who—to most outward appearances—exhibit very few significant distinctions.” – Christopher Hitchens citing the phenomenon when talking about ethno-national conflicts.
I first heard the term ‘Narcissism of small differences’ when it was used to describe what happens when libertarians and classical liberals argue. Essentially they get all bent out of shape about the tiny differences instead of appreciating the large commonalities in their political ideology.
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