This article argues that the politics of the 'right to difference' and celebration of diversity in social work is a malign tendency that is symptomatic of the malaise of postmodernism and other fashionable trends in human rights discourse. It is suggested that a normative concept of human rights as worked through postmodern preoccupations with difference and diversity is a morally bankrupt perspective. The fixation of the 'right to difference' in social work runs parallel with neoliberalism with its celebration of diversity. The article offers a set of conceptual devices for rethinking social work ethics through the writings of Alain Badiou. His subtractive ontology of truth is presented as an essentialist alternative to the relativist disc...