It's unfair to lump Sylvia into that group I think. I haven't been a fan of Sylvia by any means, but she definitely distanced herself from Alex tonight and doesn't deserve to be lumped in the bitch group yet. She really impressed me tonight, even if it is a game.
Dennis, however, was a spineless twat. Lump him in all you want.
And really, one has to think Alex is playing it up. She knows where the Charley strategy will get her -- somewhat famous and evicted early. She knows the game well, and knows the house nominates and the public decides. The fight was over almost nothing, and she had to know attacking the innocent doe-eyed Rachel wasn't going to win her any points.