Most unlikable lead character I've seen in a movie
Cameron Diaz is such a horrible person in this. I know that's the point, but usually these types have some sort of redeeming quality so you put up with them.
Steve Carrell in The Office played a terrible, bumbling boss, but they way he played it you couldn't 100% hate him.
Maybe being mean to kids made it worse than if she was just a jerk to her co-workers.