That's even more irritating than "herstory."
Neither boycott nor history is etymologically derived from a term that had a masculine origin to its meaning. Boycott is a genericism of the last name of a person who was a victim of a concerted popular shunning. History is from the Latin -- and the noun form, historia, was of the feminine gender.
Using "girlcott" (or "herstory") is distracting at best, inflammatory at worst, and childish in any event. And I'm speaking as someone who hasn't bought a Nestlé product since about 1988.