Prior work has established that lay people do not consistently treat moral questions as matters of objective truth or as merely being true relative to different perspectives, but rather these metaethical judgements vary dramatically depending on the moral issue in question and in response to different social influences. In the present research, we provide evidence for a novel account of the social function such metaethical judgements play in expressing tolerance or intolerance of disagreement. We propose that, in virtue of this, taking metaethical stances has distinct reputational implications in different contexts where the social implications of signaling tolerance or intolerance differ. Our account provides a more cohesive and unified explanation of existing findings than previous accounts. In Study 1, we find that, compared to objectivists, relativists are perceived as more tolerant, empathic, to have superior moral character, and to be more desirable as social partners. In Study 2, we replicate these findings with a within-participants design and also show that, despite these reputational costs, objectivists are perceived as more morally serious. In Study 3, using a novel pretested database of moral issues, we examine evaluations of people who expressed objectivism or relativism concerning concrete moral issues, in situations where the person either agreed or disagreed with the counterpart’s views about these issues. This study replicated our prior results and demonstrated that the effects sometimes differed substantially across conditions of agreement and disagreement and across different moral issues. These results suggest that there are important social implications to expressing different metaethical stances in different contexts, and that sensitivity to these implications may explain the observed variation in metaethical judgements.