[ErikP]

Firstly, I want to say that you were shamefully treated.

Secondly, what you have come against is partly a matter of unthinking bureaucracy. I had something similar on the Nigeria/Cameroonian border near Lake Chad where Africans can walk over the river bridge to Cameroon but whites must show a Passport and I had left mine behind. My friends vouched for my identity and honest intentions to no avail. So there is one border where it pays to be Nigerian.

I have a Masai friend from Kenya who says their poor opinion of Nigerians is because there are a number of organised criminals there who have a Nigerian connection. I suspect that is why there are these visa requirements.

Thirdly, there is no excuse for the underlying attitudes revealed.