What forum was it?
Was it the IMDB?
And I must admit that I do get annoyed when anorexia comments get thrown around about her. While I agree that she could stand to gain ten pounds or so, I don't like it when people start screaming about mental craziness. It just isn't nice. Keira should drink some milkshakes or something, if anything just to get people to shut up.
But you are right about Keira's fans tending to be assholes.