Fantasy and fiction is the only place where white people are seen as heroes.
In real life, they're calling the cops on black families having picnics, running over Mexicans in their daddy's Lambo and getting a slap on the wrist, refusing to check their racist friends and family members from committing atrocities like in Buffalo NY, bombing mosques and r*ping muslim women in an illegal war in the middle east, and generally making the world a worse place through unchecked capitalism and oppression all while destroying the only planet we live on with deforestation and climate change.
White people have been history's villains for a long time, so they have to convince themselves they are actually the heroes...
So when a Black man or Black woman enters that equation...it reminds them that they are NOT the heroes they have been conditioned and conditioned every one to believe.

Here is a member of the people you...white folks...have oppressed for centuries. Living proof that they are NOT heroes...but villains.
Black people are the real heroes...but have been made to be the villains in this society.