The creation of the internet is undoubtedly the biggest factor in this. It created a paradox in people's consumption of information. You not only had the ability to choose what to listen to, you could choose what not to listen.
Another ability the internet has allowed is the creation of communities based around the type of information they consumed which always creates echo-chambers like you pointed out.
It's because of this that many have lost sense of the realities of other people and manifests its own distorted reality.
Not to mention, you also have multi-billion dollar companies utilizing algorithms to keep you there as long as possible, further propagating this effect.
Another ability the internet has allowed is the creation of communities based around the type of information they consumed which always creates echo-chambers like you pointed out.
It's because of this that many have lost sense of the realities of other people and manifests its own distorted reality.
Not to mention, you also have multi-billion dollar companies utilizing algorithms to keep you there as long as possible, further propagating this effect.