Public intellectual life is an area of inquiry that has not received a great deal of attention within the field of sociolinguistics. This article investigates the performative dimension of public intellectual engagement in the area of language and gender and, more specifically, how epistemic authority about gender-neutral language is constructed in public intellectual contributions in Catalonia, Spain. Adopting Arendt’s notion of truth claim and the Foucauldian concepts of regimes of truth and epistemic sovereignty, we empirically examine the mechanisms of reception and validation of the public engagements of one highly visible linguistic scholar. Our study shows the ways in which this intellectual figure strives to be recognised as having exclusive scientific authority about language. We argue that pursuing the allegedly impartial standpoint of epistemic authority about gender and language inevitably advances the interests of specific political actors and large media corporations of a conservative strand that fervently oppose gender-neutral language.