> The way we do this, rather than ordering people to be kind or else, is try to help people learn to make their communication more kind. This is excellent; using love and persuasion to help someone improve is so much better than by force, compulsion, and fear. How many children rebel against restrictive and domineering parents? but a child who is loved and taught, but allowed to make choices and pursue independence u…
Just as long as we're clear that demographic D being underrepresented relative to the general population is not evidence that we make demographic D feel unwelcome. Representation relative to the population of graduated CS majors or working programmers is better, but still not necessarily the right comparison. Representation relative to, say, the population of programmers who are experts in your implementation language, or who are users of the project, or the intersection of the above, might be better. Even then, that's not direct evidence that making D "unwelcome" is the specific reason.
Direct evidence would probably be something like, take some online exchanges and show them to a bunch of {working programmers or some other decent approximation to the population your volunteers might come from}, and ask them a few questions about how they would react to these exchanges, how much it would discourage them from volunteering, whether things like it have discouraged them from volunteering in the past, etc., and then show that demographic D has a much worse response.
By the way, has anyone done studies that showed that women respond much more negatively to harsh online exchanges than men? I have a feeling they would be called sexist if they were published, but... The closest one I can think of is Pew's online harassment study[1], which said, among other things, "Women were more likely than men to find their most recent experience with online harassment extremely or very upsetting—38% of harassed women said so of their most recent experience, compared with 17% of harassed men."