Link to where this actually happened in a classroom.
There are so many citations available -- you should try Google. Here is one of the over million results.
Elementary school teacher tells students to select their oppressive, privileged identities
https://www.foxnews.com/us/cupertino-elementary-students-race-oppressed
A third grade teacher in Cupertino, Calif., reportedly hosted a lesson in which students were required to identify aspects of their identity that were either privileged or oppressed.