MollyMcGuire Good reference point.
Serenade I am curious why you felt like it’s a concept you “should” understand. Also, in what context did you come across the idea? Was it in reference to some type of conflict?
To answer your question though, I do not know much about it as a term per se, but I have recognized the dynamic involved. People do seem to have a need to differentiate themselves and feel special. Many people have family, clan, religious or tribal loyalties that make too much of minor differences. Being proud of who you are only seems to create conflict when it seeks to prove superiority or impose laws limiting freedom. This tribalism can be exploited by unscrupulous political entities in order to achieve their own ends. The gap between people an/or cultures then widens. The only way to fight it is to look for areas of common values and common goals.