In sociology and social psychology, an ingroup is a social group to which a person psychologically identifies as being a member. By contrast, an outgroup is a social group with which an individual does not identify. For example, people may find it psychologically meaningful to view themselves according to their race, culture, gender, age, or religion. It has been found that the psychological membership of social groups and categories is associated with a wide variety of phenomena. https://en.wikipedia.org/wiki/Ingroups_and_outgroups

In phenomenology, the terms the Other and the Constitutive Other identify the other human being, in their differences from the Self, as being a cumulative, constituting factor in the self-image of a person; as their acknowledgement of being real; hence, the Other is dissimilar to and the opposite of the Self, of Us, and of the Same. https://en.wikipedia.org/wiki/Other_(philosophy)

see Culture War, (2014-09-30) Alexander I Can Tolerate Anything Except The Outgroup

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