It is unfortunate, and it is a good question to ask why Rust is attracting so few female contributors.
To assume when asking that question that the project is misogynist is a bit of a stretch, however. It's worth checking the project's policies and behaviors, to make sure it isn't doing anything that provides some kind of bias, but simply starting out by claiming that Rust is "anti-female" goes a bit far.
A few things that I can think of off the top of my head:
Some of the prominent contributions from women don't show up in the list of contributors because they are not directly to the compiler and standard library which are what are tracked in this contributor list, but rather to the broader ecosystem. Julia Evans has written some good blog posts on writing an OS in Rust, that have inspired other people in this space: http://jvns.ca/blog/2014/03/12/the-rust-os-story/. Emily Dunham does some excellent work on Rust infrastructure: http://edunham.net/2015/05/20/open_infrastructure.html There are of course many more that I'm not listing here, but the point is that the Rust community, and even the upstream project, consist of more than just the compiler and standard library, though those contributors are the ones that get credited in a release since that is what is being released.
Rust is still a nascent language; while it is starting to gain traction in the industry, it is not yet broadly adopted, and thus investing a lot of time and energy in joining the project is still a bit of a risk. People who have more social capital and more free time can afford to spend more of that on projects like Rust with a lot of potential but a higher amount of risk. Unfortunately, in our society men tend to have both more social capital, and more free time as domestic labor and child rearing is still seen as primarily women's work.
There are probably a large number of other factors at play. The Rust community that I have seen has been very supportive of women contributing, and has been doing a better job recently of outreach, but there is still probably more that can be done.
Can you provide any suggestions; any place you see the project structure, or contributors, being "anti-female", or any positive action that could be done to increase outreach or increase participation?