For years the advocates of gender neutrality have been complaining against gender stereotypes. You know, the usual sort of thing: girls like to play with dolls and boys like to play with guns. Or: it takes a female to be a mother and a male to be a dad. That sort of thing.
In 1993, the organization BLO decided to become militant in undermining gender stereotypes. (BLO stands for Barbie Liberation Organization.) In the Wikipedia article about the group, we read:
They gained notoriety in 1993 by switching the voice boxes on talking G.I. Joes and Barbie dolls. The BLO performed “surgery” on a reported 300-500 dolls and then returned them to the shelves of stores, an action they refer to as “shopgiving.” This action resulted in girls opening their new Teen Talk Barbie to hear it say phrases such as “vengeance is mine” and boys hearing their G.I. Joe say “the beach is the place for summer.” …The BLO was originally conceived in an effort to question and ultimately change the gender stereotypes American culture is known for after Mattel released a speaking Barbie that said “math class is tough.”