I realized later he's a one of the biggest bulls, but only when I read it in Wall Observer BTC/USD - Bitcoin price movement tracking & discussion. That also made me realize proudhon created his account in 2011, so he must be quite okay financially because of Bitcoin.
However, until I read that, he just looked like one of the many trolls who spends his days spreading FUD. Most people aren't WO-insiders, and proudhon's sarcastic way of hiding he's a bull aren't very obvious.