Yeah, and even worse - not more than an episode or two previous to this Lori flat out told Rick that Shane couldn't accept the situation, was dangerous and had to be dealt with. So Lori goes and inflames the situation, and then gets all pissy with Rick for having to kill Shane? Yeah, I don't like Lori at all and will be rooting for her to be eaten!
Her response was very shocking. What was Rick supposed to do, sacrifice himself?
And she seriously needs to stop coddling that boy of hers.