I would say there isn't too much of a difference between them. They were all points in our human, specifically western, history that were charged with ethnocentric xenophobic hateful bigotry.
The holocaust was an attempted genocide of a significant segment of the European population.
The Zoot Suit Riots were a series of riots that broke out due to differences amongst Amerikan youth, sailors, and marines.
Blackface is an offensive stereotyped caricature of African Americans.
I ask again. What's the difference between the Holocaust, the Zoot Suit Riots, and Blackface?
Nothing. There is no difference. The type of thinking that led to these events is such that
the human race is actually split into various races of varying degrees of genetic advancement
That type of thinking is wrong.
That type of thinking leads to ethnocentrism.
That type of thinking leads to xenophobia.
That type of thinking leads to hate.
That type of thinking leads to bigotry.
That type of thinking, needs to stop.
American Anthropological Association Statement on "Race"