Sorry to disagree IO, but all sexism (and racism) is negative. The instructor who falls over himself to teach a female student, irrespective of motive....that's sexist. And worse than that, the examiner who passes someone out of generosity, giving the benefit of the doubt....that's just dangerous, and it happens, again and again in many walks of life. That is just as bad as being offhand or excluding someone based on their gender or race.
I am catagorically not saying that the GA community is sexist, as a community can't be....a person can. I think some of the comments in this thread have proved that. However, a community, as a group of people, can override an individual, and I that is to be commended. If the GA community as a whole supports bringing more women into flying, then that is a great thing. If an individual is sexist, that should be highlighted. Not punished, but highlighted, and that person should be helped to understand why they were being sexist, and why its wrong.