A big part of the argument is probably that iDevice players feel sort of cheated or something, considering iClassic was put out on iDevice first. It took a while for it to come to Facebook. So, a bunch of iDevice players get familiar with sparring against other iDevice players and are probably crushing it for a long time. Then, a bunch of experienced players from PC Graal come to Facebook and a few of them start beating on people.
I can understand how that is frustrating and might leave people feeling sour about the situation, but the fact remains that we're both given the same options. It's just how it is. These people should be mad at Graal, not mad at any player who decides to play by PC.