IMO, racism comes in degrees and, in its benign form, is wide spread. I tend to believe all white people are racist but they are not rabid ones. Pleasant, civil, white people who think all blacks look alike are racists. Ones who think all blacks have rhythm or are good athletes are racist.. Ones who want to touch your hair are racist. Ones who tread lightly around blacks because they don't want to appear racist, are racist. These racist types mean no harm. They know racism is wrong and choose not to practice it if nothing is to be gained by doing so. And this could apply to mixed couples. A white woman who has a bi-racial daughter is racist when she looks upon her child's nappy hair as an anomaly she has to try and tame.
I think Donald Trump was born a racist because he was a child of privilege and wealth, circumstances that go hand and hand with racism and he is well qualified to use racism as a tool. i even think, Bernie Sanders is racist. He is paternalistic and patronizing and thought he knew what was best for blacks. Hillary Clinton, too, but she is shrewd enough to keep her racism in check.
Black people can't be racists but they can be prejudiced and when it comes to white folks, they harbor many prejudices about them..
Everybody is bigoted to some degree. But, as we all know, not everybody can empower their biases.