Otherside
Actually, it would not surprise me if they were. It is a social anxiety forum after all. It wouldn't surprise me if they couldn't be as much of a bullish, arrogant jerk in real life without panicking at the thought of the other person's reaction, and so they just behave well...quiet and polite. Unless of course they're with someone who completely agrees with their views on life and they can rant away about how they are a nice guy and all woman ever go for are arseholes or whatever.
It's a lot easier to be nasty online than it is in real life.