Latent feelings of economic vulnerability and social stagnation may have catalyzed the unprecedented uprisings that shook Latin America and other parts of the world in 2018-2019. We document this process in the context of Chile, leveraging survey data on protest participation and its potential determinants. Specifically, we construct a “social gap” index, measuring the disconnect between objective and perceived social status. Our findings suggest that this social gap predicts protest involvement beyond factors such as perceived living costs, the subjective value of public services, peer influence, or political demands. Notably, it complements broader feelings of anger toward inequalities in explaining protests.