She's talking about the leftist segmentation of society into every imaginable separate box:  the gay box, the LGBT box, the latino box, the black box, the white male box, the Jewish box, the white female box, the black female box and the occupants of each of the designated boxes have specific social justice obligations in terms of what they can and cannot say, who they can and cannot support, how they must vote, etc.  Not all of the boxes are created equally.  If you deviate from the behaviors assigned to your box you are a racist, misogynist, anti-semitic, nazi, cultist, whichever label fits the situational narrative.