This is also a media stereotype as well. Hollywood movies and TV series rarely depict Black women working in tandem or cooperating to get things done. Only in the last several years when Black women started telling our own stories (with black female showrunners and writers) have we gotten good depictions of Black women allyship.
But the industry which has traditionally (and still is) largely controlled by white men, has almost always depicted marginalized people (including white women) as entirely alone (no friends, or family) or in contentious relationships with each other, if there is ever more than one of them.