I believe there is a Liberal Bubble. And it's not little.
I believe that a large number of secular humanists rarely, if ever, come into meaningful contact with conservatives or conservative ideas.
Kick me for bringing up Dennis Prager again, but I think he is dead on with this observation: It is possible for a liberal in America to go through his whole life without encountering conservative thought in any depth or significance (though it will be presented to him in caricatured form).
By contrast, conservatives constantly come into contact with liberals and liberal thought. There is simply no avoiding it, since the major societal institutions -- schools/academia, arts and entertainment, the mainstream media, even the government and courts -- are bastions of modern liberalism and "progressive" activism.
A couple of things I've read recently brought this home for me.
The first was written by a regular reader and commenter, MaiZeke, on her own blog. She told her readers:
One of the reasons I’m following this other blog [Little Catholic Bubble] is to actually hear how conservative minds think (esp religious conservative minds). I just never meet anyone like this in real life...
And then, from Mrs. M, on the question of objective truth:
I have to be honest and say that the idea of 'truth' isn't something I've thought about too much in my life, so I can't guarantee that my position on it will be very clear.
Now, I think it's commendable that MaiZeke comes to this blog to find out how we think. I wish more liberals were as open-minded as she. I hope that she discovers over time that our conservative positions are reasoned and consistent, even if she doesn't ultimately agree with them.
And I appreciate Mrs. M's honesty. If she hasn't thought too much about the idea of "truth," it's because it isn't taught anymore. There has been a huge paradigm shift in education over the past few decades. Truth used to be the end of education. It was the goal. Today, it's entirely possible for an American student to go through the entire education system (kindergarten through graduate school) without having been taught to seek what is true, good and beautiful.
Living in a bubble is not good if it's about purposely insulating oneself from those who live and think differently. My "bubble" (a silly name I call my Catholic community) is a joy and a comfort; however, I venture out often to engage a spectrum of people and ideas. Some liberal readers have taken shots at me for living in a "Little Catholic Bubble" -- and then they've scurried away to bubbles of their own, never to be heard from (or challenged in their thinking) again.
I am grateful that MaiZeke and Mrs. M are not like those hit-and-run liberals. I am grateful that they have chosen to stick around and get to know us better.