What. The. Hell? It's been established over and over again that while Lois does love Superman, she loves Clark too. Clark is probably first in her heart, but I'm not entirely certain that she differentiates all that much. She loves her husband, whether he wears tights or glasses. He's her love.
Heh. That totally pissed me off, too. But, as it turns out, that Clark is a robot. Which makes the comment make perfect sense. Lois doesn't like the robot, because he reminds her of her love, but he's not her love. I agree with you about it being confusing, however, since both Supes and Lois keep referring to the robot as Clark, despite the fact that Clark is Superman's real name and the name Lois would be used to calling him by.