This is the argument that I've heard from most outwardly racist people, that it is somehow in our genes to be racist. I would love to see some research on this but I strongly feel that racism and bigotry is a learned behavior. It may be human nature to stereotype and that likely served humans well in the past but bigotry is definitely learned and it isn't okay to be racist, sexist, homophobic etc. bigot and hide behind some 'culture'.
Edit: Post isn't meant to be directed at you specifically, of course.
I think that a lot of it has to do with cultural stereotypes that are absorbed almost unconsciously. For instance:
A survey was conducted in 1995 asking the following question: "Would you close your eyes for a second, envision of drug user, and describe that person to me?" The startling results were published in the Journal of Alcohol and Drug Education. Ninety-five percent of respondents pictured a black drug user, while only 5 percent imagined other racial groups. These results contrast sharply with the reality of drug crime in America. African Americans constituted only 15 percent of current drug users in 1995, and they constitute roughly the same percentage today. Whites constituted the vast majority of drug users then (and now), but almost no one pictured a white person when asked to imagine what a drug user looks like. The same group of respondents also perceived the typical drug trafficker as black
There is no reason to believe that the survey results would have been any different if police officers or prosecutors - rather than the general public - had been the respondents. Law enforcement officials, no less than the rest of us, have been exposed to the racially charged political rhetoric and media imagery associated with the drug war. In fact, for nearly three decades, news stories regarding virtually all street crime have disproportionately featured African American offenders. One study suggests that the standard crime news "script" is so prevalent and so thoroughly racialized that viewers imagined a black perpetrator even when none exists. In that study, 60 percent of viewers who saw a story with no image falsely recalled seeing one, and 70 percent of those viewers believed the perpetrator to be African American.
Decades of cognitive bias research demonstrates that both unconscious and conscious biases lead to discriminatory actions, even when an individual does not want to discriminate. The quotation commonly attributed to Nietzsche, that "there is no immaculate perception," perfectly captures how cognitive schemas - thought structures - influence what we notice and how things we notice get interpreted. Studies have shown that racial schemas operate not only as part of conscious, rational deliberations, but also automatically - without conscious awareness or intent. One study, for example, involved a video game that place photogrpahs of white and black individuals holding either a gun or other object (such as a wallet, soda can, or cell phone) into various photographic backgrounds. Participants were told to decide as quickly as possible whether to shoot the target. Consistent with earlier studies, participants were more likely to mistake a black target as armed when he was not, and mistake a white target as unarmed, when in fact he was armed. This pattern of discrimination reflected automatic, unconscious thought processes, not careful deliberations.