Ingroup/outgroup dynamics are actually very well studied area of sociology/evolutionary psychology. It's extremely fascinating. https://en.wikipedia.org/wiki/I

Ingroup/outgroup dynamics are actually very well studied area of sociology/evolutionary psychology. It's extremely fascinating. https://en.wikipedia.org/wiki/Ingroups_and_outgroups https://en.wikipedia.org/wiki/Ingroups_and_outgroups