Because they r idiots..
or
This focus on women has not been arbitrary—discrimination on the basis of gender has been a particular problem for women, especially in employment settings. Further, even though women now comprise nearly half of the workforce in most developed nations (Pew Research Center, 2017c; United States Bureau of Labor Statistics, 2017), there are still important domain-specific gender imbalances, such that women remain dramatically underrepresented in occupations that have been traditionally dominated by men. This imbalance puts women at an important social and economic disadvantage, as these positions tend to hold the highest prestige and status, as well as higher monetary and social rewards (Cejka and Eagly, 1999; Hegewisch and Hartmann, 2014; Levanon and Grusky, 2016). Because gender-based discrimination has historically interfered with women’s professional success and continues to hinder their social mobility, gender bias against women is an obvious and central impediment to gender equality. Thus, the focus on gender discrimination against women – and not men – makes sense from a historical, cultural, and political point of view.
The fact that discrimination continues to affect women more than men, however, does not necessarily mean that men cannot be the targets of gender bias in evaluation. Although empirical research has focused almost exclusively on women, most psychological theories of the antecedents and consequences of gender discrimination are not meant to be gender-specific. Rather, many of these theories are posited as explanations of gender bias more generally and therefore should also be able to account for patterns of discrimination against men, should they exist. Though these social psychological theories about gender discrimination have shown themselves to be useful in explaining why, when, and how women encounter barriers in traditionally male roles and occupations, whether they can also explain the potential limitations men encounter when seeking entry into traditionally female domains remains to be seen. Thus, examining whether and under which circumstances men are discriminated against on the basis of their gender has important theoretical implications.
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