Probably because the effects of one's personal indecency aren't visible over the Internet. It's much easier to be rude when the person you're being rude about isn't right there in front of your face. (In fact, I think it's analogous to the cheapening of human life that critics of modern war talk about-- i.e., the modern conception of warfare as a situation where you push a button, and an enemy soldier dies a mile down-range; quite different than going out with sword and shield and actually cutting his flesh, hearing his scream, feeling his blood spraying you in the face.)
Actually, it's one thing to be rude and unpleasant to other people. It's quite another to assume that rudeness and unpleasantness automatically make someone more intelligent or interesting than the common crowd.
Or, in the words of raisa,
My grandmother has become "radically honest" in the last few years, only we don't call it that.
We call it small strokes that have diminished her ability to filter what she says or does, causing her great humiliation and loneliness as the people who don't understand it, distance themselves from her. We call it asking her great grandchildren to ignore her when she calls them names because she doesn't mean it - and the result is that she doesn't get to see two of them very often. Oh, and we call it a medical condition that we hope doesn't worsen to the point where she has to go into a home.
But, if someone wants to call that radical honesty instead of a untreatable medical condition, who am I to argue with them?
Off to work now, to make up for the time I missed because of snow.