ingroup bias
the tendency to favor one’s own group, its members, its characteristics, and its products, particularly in reference to other groups. The favoring of the ingroup tends to be more pronounced than the rejection of the outgroup, but both tendencies become more pronounced during periods of intergroup contact. At the regional, cultural, or national level, this bias is often termed ethnocentrism. Also called ingroup favoritism. See also group-serving bias.