His groupbuy post is here:
https://bitcointalk.org/index.php?topic=480601.0He's trying to "sell" Avalon Gen2 200GHs unit for 2.0 BTC. In response to other members questioning the price and requesting proof he has the units, he's showing his true colors.
From my experience, scammers typically lash out when questioned this way.
One interesting thing is if you click on his "trust" link, you will someone, a jr member since Nov'2013, has posted 2 positive feedback. This can be a ruse, though.
Anyway, please be very wary when dealing with someone who reacts angrily and tries to demean senior members like he's doing.
Peace out!
James