In a broader sense I'd say it's also a societal problem. Growing up in a more traditional society as well as a Christian community, I had to deal with a huge va

In a broader sense I'd say it's also a societal problem. Growing up in a more traditional society as well as a Christian community, I had to deal with a huge variety of people and opinions on a regular basis, whereas nowadays the default is to associate with 'people I like', which tend to be people I agree with. And because others do likewise, it's difficult to actively counteract that, much as I try. Of course there were some strong biases in these 'older' communities too (views on sexuality, abortion, etc.), but generally speaking people inside them varied greatly in political views, social class, upbringing, lifestyle, habits, and so on. It gave a face to many opinions that I would consider offensive or dangerous, and by extension an understanding and empathy that is much more difficult to have these days (for me). I fear for the future of our societies (and social safeties) in part because of this. Changing views often starts with mutual respect, and that's much more difficult to do when opinions get separated from those who hold them, and when interaction is increasingly opt-in.