I haven't been to a white dominated country before, so I can't say that i've faced any form racism or discrimination due to my skin color. But I may have experienced one or two segregation shown at people of the same origin as me here in my country.
Just like @ruthmongare stated, we also have an overwhelming 350+ tribes in my country with 3 classified as the major tribal groups. I happen to belong to one of the three major tribes, but for some genetic reasons, people find it very difficult to tell which I belong to. I kind of like it that way because under this disguise, i've learnt a lot about behaviors of certain groups.
Drawing from the last paragraph, i've been in situations where people close me belonging to other regions or tribes talk emotionally ill about people of my own tribe. They often go as far treating them badly which off course unnerves me. Most times I keep quiet and try to understand why they behave in such manner. But in some cases when am unable to stomach their actions, I challenge them by revealing my true origin.
My point is, people often judge others because of stories they've heard without getting close to see for themselves whether it's true or not. While some do it unconsciously due to their upbringing or personality. Anyways, It all boils down to human behavior and psychology.There's very little or nothing that can be done to change it so long as culture, race and religion continue to exist in our world.