1) IMHO, people use quantifiers like majority, mostly, rarely, etc not because its the absolute truth, but because its their subjective PoV

2) Dont trust everything you read on the internet. A lot of it is skewed by personal biases.

They’re probably concentrated in your capital’s ethnic enclaves.

Just out of curiosity, where do you live?

Must be a lot of light skinned South African, Algerian and Namibian immigrants then /s

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?

Both are true. A lot of those posts you think are from internet trolls are actually real concerns, mostly from poor people, whose neighborhoods the immigrants were sent to, and it's they who are feeling the costs of that.

But who cares what poor people think though, right? lol

They're Russian troll farms. If you go on their profile, that's all they do. Post about immigrants, how the EU is turning people gay, and how Trump will save the world. It's quite simple to tell them. Like who the hell posts 2000 political memes on their profile without taking about anything else. It's so obvious