In the end only kindness matters...

Well, I have never noticed this "resting bitch face" but in Russia I used to notice very often another expression on female faces. It was a mixture of contempt and sneer, and it was the usual face worn by teachers and other women who's got high education but didn't earn enough money in their lives. In their childhood and youth they were taught that they shouldn't swear, shouldn't fight like boys etc. So all they could do in a situation when they were offended or angry was to show how they despise their adversaries, to show the latter that they are mean and miserable in comparison with a woman they have offended. As a rule, adversaries (especially if they were from a lower class, some hooligans without even the full secondary education) were not frightened by such an expression but it was the only "defense" of these women, and they used it too often and finally such a face fixed tightly to their faces...