> We know because they tell us.

But not marginalized groups also tell them. Now the question is who tells more? I think marginalized, because they read all these blogs and tweets about being opressed, shift their selective focus to minor injustices, and feel empowered to complain. The SJWs are the complainers, they are the warriors, that's why you hear from them more than from anybody else. They have the momentum of complaining, so they are more likely to continue to complain. I'm certain most of them are addicted to complaining and will never stop, no matter what. Also, minorities have higher social status within those ranks, and therefore more likely to be SJW.

So it's not necessarily Stack Overflow's fault at all.