A large telephone survey conducted after the attacks of September 11, 2001, suggests that the willingness to tolerate discrimination varies significantly across domains, with a very high tolerance of discrimination against poorly educated immigrants and a strikingly low tolerance of discrimination against the genetically disadvantaged. Regardless of domain, tolerance is greater among men than among women. A survey conducted simultaneously over the World Wide Web, using volunteer panels, replicated the phone survey results and revealed an even larger sex gap. This finding suggests that a social desirability bias leads women to overstate and men to understate their tolerance of discrimination in public. © 2008 University of Utah.