Never assume that just because somebody is a member of a minority they're not prejudiced assholes.
It's exactly because we're all humans that assholes are equally distributed across all groups defined by things other than behavior and political beliefs - no such group is inherently composed of better or worse individuals than other groups.
People in groups being oppressed are less likely to behave as assholes simply because the assholes in those groups fear reprisals far more than the assholes in the dominant groups and in my experience plenty of people who behave meekly because of being part of an oppressed group will start behaving as assholes if given power and immunity to reprisals.
This is how you end up with phenomenons like, for example, anti-Transsexual Feminists.