I took it to be more about nerds online. I haven't met too many people face to face that are even a tenth as rude as 90% of the people I see online. Of course, I arbitrarily picked those numbers. I'm going to point that out before I get flamed.
Louis CK touched upon this in his "Oh MY God" show on HBO. Empirically speaking, people tend to act with less accountability when they're inside of cars, behind protective barriers, including the internet.
