The researchers found that feminine STEM role models decreased girls' self-rated math interest, ability and short-term success expectations. They also had a negative impact on girls' future plans to study math among girls who did not identify with STEM [...]
Replicating past research, this work suggests that role models whose success seems unobtainable can make young students feel threatened rather than motivated. But even if they see feminine STEM role models, girls who do not care for math or science might not be motivated to like these fields.
"Rather than opening these girls' minds to new possibilities, the feminine STEM role model seemed to shut them further," said Sekaquaptewa, U-M professor of psychology.
The overall study raises the possibility that role models who counter more than one competing stereotype (women can be good at math or be feminine, but not both) are less effective than role models who just counter one (e.g., a typical woman who excels in STEM). The researchers also say that young girls may see their success as difficult to emulate if they believe that women in STEM are "too good" to be role models.
Taking a look at this sentence again: "But even if they see feminine STEM role models, girls who do not care for math or science might not be motivated to like these fields.". Next logical step, force them into STEM at gunpoint.