Dude, I am very sorry for you. It’s unfair and bothering and some people are stupid. In the meantime, I have had the reversed experience with American black people. I am universalist and met a woman who was like screaming over all roofs that she is “african american”. She said she’s black and started every phrase with “as a black woman, …” everytime we were discussing about everything. She had just a black grandmother and looked like a portuguese or other mediterranean (I live in Europe). She reduced all discussion to racial discrimination. Her bf dropped her? He’s racist! She doesn’t find a job? It’s because people are racists! Dude, as said, most people here wouldn’t even have an idea she had a black grandmother.
I’m not trying to trivialize or mock your experience, and I’m deeply sorry that this happened to you. Being stereotyped is one of the most shitty experiences. I’m just saying that seeing from outside the USA, americans are among the people most obsessed with the idea of “race” and THIS is absolutely irritating. For the rest - you might have met real idiots, or maybe just ignorants who consider Black = Africa. It is not supposed to happen in multicultural countries or those who have colonies, but I am coming from an eastern european one, and there, people seeing a Black or an Asian have a reaction of curiosity and stupour. Which is stupid, I reckon, but not everytime ill intended. More multiculturalism should help people be used to the fact we are not all looking the same, but it’s a long way to go. I hope these bad experiences haven’t obliterated your apetite to travel and discover the world! <3