I always was amused when it was said that blacks can’t be racists. Well they are, but they are only started to be called out as such.
A lot if light-skinned blacks look down on darker-skinned blacks. They think they are stupid and that they are the only ones capable of speaking for all black people.
From personal experience, and from what I have been told by various "people of color", many blacks are absolutely racist. They are even racist against one another - the lighter-skinned being racist towards the darker.
To suggest that blacks cannot be racist is incredibly stupid and ironic, as it is itself a racist statement. The simple fact is that ANYONE can be a racist, and in some way, at some level, almost everyone is. That's human nature.