British Journal of Political Science
Partisan (In)Tolerance and Affective Polarization
2026-05-13
Political tolerance of others’ civil liberties is an essential and everyday condition of democratic politics without which citizens cannot engage constructively with those of different views. In this paper, we combine insights from political theory and political behaviour to develop and test the concept of ‘partisan intolerance’. We conceptualize partisan intolerance as the gap between a person’s willingness to interfere with contentious activities by in-partisans versus the same activities by out-partisans. Using two pre-registered experiments, we find high levels of partisan intolerance in Britain. Moreover, while partisan intolerance is not associated with abstract measures of political tolerance, we find a strong association with affective partisan polarization. Our findings thus suggest that increasing affective polarization among partisans is accompanied by a high degree of intolerance towards their opponents’ basic civil liberties such as freedom of speech and the right to protest.