Most of the discourse that we see is where groups of people are intersecting that wouldn't really meet in the real world because of the echo chambers we keep.
The Americans are often saying that they only see that crank uncle, or their liberal nephew or niece, at thanksgiving, and, honestly, it's the same for the rest of us around the world - we're normally only exposed to the very different viewpoints at family gatherings.
IRL we try to avoid conflict, and try not to associate with people that hold views that are vastly different to our own, so much so it's considered "unprofessional" to have the discussions at work that would show how different everyone's (political) viewpoints are in the workplace.
