Prejudices around disability are so deeply rooted in contemporary societies, especially in the Latin American context, that it is necessary to reflect on the roots of this phenomenon. Thus, delving into the eugenic projects of the last century, in relation to the new contemporary forms of eugenics, allows us to understand what a functional and capacitive conception has caused in the notion that we currently have of human nature. Moreover, when behind these projects there is an instrumental and individualistic defense that ignores the relational and social character of human beings. This article insists on the need to look again at the social model of disability to understand that it occurs when of personal limitations meet social barriers.