I was responding to your post: Yes, and the researchers aren't even considering the possibility that these women sound incompetent when talking to men, because they actually, comparatively, are. The researchers were investigating how much of the perceived competence difference was real and how much was a difference in perception only. So they controlled for actual differences, and found a large difference in the way equally-competent men and women are perceived.
But aside from that, wouldn't you like to get the women are are actually good at math and science to get into STEM fields, even if they are a minority? I think that's a question we can actually do something about, even if we can't change how good women are at science. http://www.macleans.ca/general/girls-good-at-math-half-as-li... I'd like to encourage good female programmers, however many of them there are, to go into programming jobs.
They don't sound less competent when talking to women because they aren't less competent than other women, on average.
Playing dumb won't help you win this argument. It will just make you look just as dumb as the researchers.