One of my favourites, I was using a 30 card rush deck against a newbie using a 60 card monodark. He was laughing at me in chat even before I'd taken a turn because I "couldn't afford a bigger deck".
I encountered a new player throwing a fit in Kong chat today. He was screaming about his opponent having 200 HP and drawing two cards at a time. Apparently, a player with the In-Game Name (IGN) of "Lionheart" was the first hacker he had ever encountered. If only he knew...