It sounds like we're in agreement on the cause of sexism in video games - that's what I meant by "I think the industry is the cause of all of this."
To add some more context,
looking at the history of gaming, the undystry was male-dominated even at the beginning because "not many women held bachelor's and master's degrees in computer science and engineering" at the time, but sexism weren't really a problem (no more than it was in any other industry, anyway). Additionally, video games weren't marketed specifically towards any demographic. The stereotype that "video games are for boys" happened as a result of the North American recession in the video game industry in 1983, when they had to target their advertising more precisely, and they decided the target market was little boys. We've pretty much been going backwards since.
I pretty much agree with your post. :>
~Psychic