It's not that they aren't challenged for any given opinion, If you go into the wrong place you still get lambasted but then you'll just say "oh that's because I put an insert group here idea in an insert opposing group forum and thats why I got downvoted. The problem is how easily you can put yourself in a bubble online, compared to real life where unless you work/shop/live in the same community of like-minded people you'll be forced to eventually come to grips with the fact that you're one of many POV's.

It's hard to tell how popular or unpopular your opinion is in terms of the average person, now. Since it's all just chatrooms online with vague numbers of subscribers, etc.