From counter- +‎ discrimination.

counterdiscrimination (countable and uncountable, plural counterdiscriminations)

1. Discrimination against a group previously dominant in perpetuating discrimination.

   Hyponym: reverse racism

   • 2010, June A. Gordon, Challenges to Japanese Education, page 120:

     Burakumin created jealousy toward Burakumin among non-Burakumin citizens, sometimes fulminating into claims of counterdiscrimination.