Don't need to be on the internet to do that, hell look at people who watch Fox news or Alex jones/Breitbart. They're mostly old af and still manage to brainwash themselves. Liberals tend to need the actual physical echo chamber, hence safe spaces and the decay of our universities.
Despite being a left leaning person myself, I still think those fox news people can actually handle an in person confrontation better. Say we were at the bar and someone made some typically right wing comment about climate change being fake or Muslim immigrants causing chaos, I feel like I could challenge that person and have a heated discussion but it wouldn't be a scandal. I probably wouldn't change their mind or anything but I also know the conversation would be kept within the bounds of that pint of beer.
I don't know if I think the same about some of my liberal friends. I feel like if I were to challenge some of their views they'd drop me in a flash and take it personally right to the grave.
I think it's silly to say one side does something the other won't. Crazy doesn't have political leaning. There's plenty of people on both sides who are completely closed off to any open discussion. And plenty who aren't. ---