I generally see one black person per month, but according to internet trolls, my country is flooded with Africans.
2) Dont trust everything you read on the internet. A lot of it is skewed by personal biases.
I suspect why this is overestimated has a lot to do with media treatment. Different people than you moving in is scary to people, scary things get engagement, engagement gets eyeballs in front of ads. I don't know how to measure this though because this model is so ubiquitous, where would you find a control?
But who cares what poor people think though, right? lol