Of course one can be a racist, even though they are victims of racism themselves.
Just look at how many blacks are bigoted against each other, based on the "darkness" of their skin color.
Or say that they should only be in relationships with other blacks.
Who ever said humans were "rational, logical, and reasonable"? LOL
If we were ... religion would be the first thing to go, followed by war.
I'm sure some psychiatrists could explain it.
Just as they could explain why some children of wealthy parents went to Lebanon in the early 1980's, just to kill people.