As a long-time member of the Rust community I am seeing this changing over time, but much more slowly than I'd like. Rust is a very friendly community; we have an actively-enforced code of conduct (which has been in place since the project started >5 years ago); and some people in the community have recently put resources into things like sponsoring women and minorities to go to the first http://rustcamp.com/ conference. The RustCamp CFP had a blind review process to help avoid bias. The Servo team is currently sponsoring an Outreachy intern. And we are definitely looking for more ways to be as welcoming as possible to everyone.