Does group-based tribal thinking against ethnic out-groups condition support for both liberal and illiberal policies? Our thesis is that, irrespective of the direction of the policy (progressive or conservative), nativists express selective support for policies based on different signals of group-identity: descriptive markers, group-based substantive representation, in- and out-group norms, and group-based reasoning. We test this theoretical expectation using a novel AI-powered visual conjoint experiment in the Netherlands and Germany that asked individuals to select between hypothetical educational reform proposals presented by civic actors during a public consultation. Empirically, our results demonstrate that citizens, on average, are indeed selectively (il)liberal and that this instrumental policy support is greater among those with higher levels of underlying nativism. Specifically, we show that—among our multidimensional markers of group-based identities, norms, and reasoning—group-based substantive representation and in-group norms are the strongest determinants of support for diverse reform proposals. These findings have key implications on the malleable nature of citizens’ support for the backsliding of the liberal tenets of democracy as well as the persuasive power of out-group disidentification.