This study, situated in the United States, is set in a context where large and growing numbers of children from non-dominant backgrounds populate American public schools while the vast majority of teachers teaching in US schools are White, monolingual women who may not have the requisite expertise to teach children from non-dominant backgrounds. This work focuses on the learning of three White teachers enrolled in a literacy course designed to foster teachers' understandings of racial, linguistic, and cultural diversity. Results revealed that the three focus teachers, all members of a small online Book Club within the focus course, assumed different dispositional stances towards learning about diversity. Moreover, their overall dispositional stances shaped the ways they positioned themselves as learners in the course as well as what they learned in the course.