Broadly, I agree - as a POC from the global south, I find the Fediverse a lonely hostile place. There are practically zero people from Africa or Asia or Latin America here.
Subjective experience: I find Americans here less offensive, simply because most of them are completely absorbed in their own bubble. They have no interest in even American foreign policy. They only care about what's happening in their country, their state, their city, their neighborhood. Or they are obsessed with software or cats or whatever. They are mildly annoying, but it is easy to scroll past their posts.
On further reflection: I think the most "missionary-minded" of the American liberals who used to be on Fedi have all decamped to Bluesky after the 2024 US elections. That has made the American cohort here tolerable.
I find posts by many Southern Europeans, especially the Greeks and the Spaniards and the Portuguese, interesting and engaging. They remember how Germany and other dominant EU countries fucked them over during the Eurozone crisis, and this memory shapes their political understanding.
In contrast, the Western and Northern Europeans, especially the British and the Germans and some Scandinavians, who form the bulk of the Europeans posting here in English, are full of "white man's burden" of civilizing the black and brown savages. They are so cultured and civil - they glow. All of them are liberals, and they have more faith in their mission than a saint has in Christ. They show no capacity for reflection. They truly believe they are engaging with everyone as an equal. They are insufferable.
This is how the Fedi will remain, I think. There are far too many structural barriers for global south POC to join in large numbers.