Modern research weights social processes in prejudice even more than Allport did

Evidence

By contrast, Allport presented a careful balance of personality and social factors underlying prejudice, although it must be said that when Allport assigned half of all prejudices to conformity, he deemed it the single most important factor in the acquisition of prejudice. Even given this very high standard, social psychologists might now point to a wide range of research (reported here and elsewhere throughout this volume) that emphasizes social processes even more strongly than he did. — John F. Dovidio, Peter Glick, Laurie A. Rudman, On the Nature of Prejudice, 1930