> Not that there is anything wrong with American political thought being exported.

I strongly disagree. The vitriol, demonizations, oversimplifications, "every issue has exactly two sides - ours and theirs" limitations of the space of thought, virtue signaling, bullshit / distraction issues, puritanism, etc... There is much wrong with exporting these. These things are happening especially on social media.

There's nothing specifically American about these. It's just the kind of political discourse that gets structurally amplified by social media sites that are clearly maximizing mass "engagement" with posted content.

It's a mix of many things, some of which are more specifically American (e.g. puritanism) and others less (e.g. two-party system effects). Twitter is present everywhere, but the importance it is granted also varies a lot from country to country. That is again local culture.