What I liked about it was that Lois was getting all typically scared about a relationship, throwing up her usual walls, and Clark wasn't letting her. [Big Grin]
That seems to be reading an awful lot into the line to me. I just don't see the evidence that she's scared of relationships or frequently has walls around her in this version. It's rather like saying Clark must have something going on with the waitress (or that she must want something) because she called him "sweetie" - didn't see that, either.