This article proposed that after social exclusion, individuals may react in a hostile or amiable manner, which depends on the type of categorical similarity cues that new groups possess. For excluded individuals, groups that resemble their excluder would provoke a defensive attitude. They also exhibit hospitality to groups that resemble themselves to gain inclusion. In Experiment 1, social exclusion was manipulated by providing a scenario story regarding an individual who was excluded and subsequently wanted to join in new groups. The results indicated that participants in the social exclusion condition avoided groups that resembled the previous excluder, whereas groups that fit their characteristics were preferred. In experiment 2, the cognitive load was manipulated. Heavy cognitive load made participants in the social exclusion condition only avoid groups that resembled the excluder; in contrast, they exhibited no preference for groups that may be suitable for them.
Keywords: Aggression; categorical similarity cue; group selection; prosocial behaviour; social exclusion.