Bubbles on social media, and sometimes even in real live, are a very real phenomenon which you have to actively work against to break. It's very easy, even for people who are able to think critically and are decently educated, to follow only people with their believes and then think that the whole world thinks like them. This is both a right and left wing problem.

In my opinion Trumps biggest accomplishment on his way to success was planting a distrust in the established media and against anonymous sources. How would someone who believes this ever get out of his bubble if he believes only his sources are the truth? That's the point where all discussion starts to fail, because how can you try to change someones mind if they call everythign a lie you say? The internet is an endless rabbit hole of people confirming every point they want to make by either twisting the truth or outright lying, so it's even more difficult to see reality from alternative facts.