Why is it so difficult for people to grasp the concept that multiple things can be true at the same time?

Class and race are intertwined. Additional intersectional factors are likewise intertwined with those two.

Rather than "class-first" or "race-first" (or "gender-first") -- maybe the narrative needs to shift to "all of the above"...???

Essentially, "class-too," "race-too," "gender-too," et. al.