The Border House recently posted a piece about the insults players of Facebook games are subjected to. I don't play games on Facebook myself (well, I clicked my cow a couple of times before forgetting about it, if that counts), but I appreciated the sentiment. I don't like it when people are judgemental about the recreational choices of others. Or, when all Facebook gamers are lumped in with the ones who neglected to feed their children (clearly a bit more going on there than just FarmVille).
After people who play Facebook games, the most maligned gamers are probably World of Warcraft players. Although "Go and play a real instrument!" must be up there somewhere, too.