Intergroup Emotion Theory (IET)

The idea that when social identity is salient, group-based appraisals elicit specific emotions and action tendencies toward out-groups. That is, when group membership is salient and situations are appraised in terms of their consequences for the in-group, specific intergroup emotional reactions and behavioural intentions are triggered.

Reference:
Mackie, D. M., Devos, T., & Smith, E. R. (2000). Intergroup emotions: Explaining offensive action tendencies in an intergroup context. Journal of Personality and Social Psychology, 79(4), 602-616. doi: 10.1037/0022-3514.79.4.602.