Biases such as this are historically systemic and are perpetuated by various social stereotyping. You just have to look through any PC magazine or other publications to see the reality. Women, for example, in gaming issues are portrayed as "big busted, small waisted, Conan-style, non-thinking, disposable" characters. In other PC industry publications, women are still depicted as your "phone person", the "secretary/clerk", the "water cooler bimbo" and so forth. Both our government and our religious factions still see "women's work" to be of no real value and limited to the "home". I recall some years ago the discussions around the issue of "pink ghettos" that technology would be creating. In some cases, it has become defacto but not how we envision them. How many times have you heard on the TV or read in articles that women just can't make good gaming software? Balderdash (or crap if you prefer).
On a personal note, a fairly new peer manager (male) came storming into my office and asked why the upgrade to an application was not yet in production since it has now been in house for over a week. I looked him in the eye and said, "So you want all your systems to crash because this new stuff isn't being tested for stability, etc.?" He said, and note that he is supposed to be an IT Manager, "Why do you need to do testing at all? This application has been in use for a number of years and this is only an upgrade to it." I told him that it wasn't just an upgrade but that it would introduce a web GUI on a currently used Client/Server app and was totally new to all.
So then I sent him away with a minor scolding and told him not to darken my door again until we were satisfied with the testing QA. He promptly went to our boss, also male, and said that I was a nasty person and must be PMSing all the time. FYI, his total IT experience has been only a few years, approximately five, with no real foundational training. Whereas I've been in the business for as long as Bill Gates (only better looking). Yet PMS is a more significant issue for him to point out rather than the IT best practices I was employing. Our boss scolded me and insisted I move the application into production a.s.a.p. regardless of my verbal opposition.
Well, I first wrote an exception memo outlining the best practice reasons why this was not a good thing, what will surely happen if we move forward without the appropriate controlled testing, and that I would not support the decision to move. However, I also wrote that since the BOSS insisted on this "new process", it would be done. (Trust me, I did it in a very politically correct way.) And to sum up, the application indeed bombed, front facing customers complained and it was very clear at the end of the day who, what, how, where, and why we were down on a front facing revenue system for over two days.
Fortunately, my memo, although not presented to senior management, ensured that my staff and I followed all stated procedures and so, the sh**t didn't hit our fans. Needless to say relations have since been very icy but when it comes to best practices for all things IT, there are no further challenges.
The moral of this personal story? Sexism still exists in so many facets, some more subtle than others, that unless all are on the same page it will never be eradicated. Another proof in point, look at the mess in the Middle-East and in Africa. Women are still being subjugated and that same (both religious and cultural) attitude is being dispersed through immigration world wide. I support immigration and respecting all cultures and religions regardless of my own situation. However, when it comes to importing sexual discrimination practices, we don't need anymore. We need to fix our own, now and forever.