Intolerance toward ideological outgroups: We show that conservatives are more ideologically intolerant than liberals and that the more intelligent are more ideologically intolerant than the less intelligent

Ganzach, Y., & Schul, Y. (2020). Partisan ideological attitudes: Liberals are tolerant; the intelligent are intolerant. Journal of Personality and Social Psychology, Sep 2020.  https://doi.org/10.1037/pspi0000324

Abstract: In this article we examine intolerance toward ideological outgroups, conceptualized as the negativity of the attitudes of liberals and conservatives toward their ideological outgroup. We show that conservatives are more ideologically intolerant than liberals and that the more intelligent are more ideologically intolerant than the less intelligent. We also show that the differences between liberals and conservatives and the differences between the more and less intelligent depend on ideological extremity: They are larger for extreme than for moderate ideologists. The implication of these results to questions regarding the relationship between intelligence and ideological intolerance and regarding the relationship between ideology and prejudice are discussed.