I agree that Lois's words weren't exactly well chosen (knowing her husband). We all knew what she meant, probably Clark did as well, but nobody likes company more than misery.
Double ouch! That Clark hasn't seen his wife OR kids in weeks.

That's not good.
Clark! Lois needs to slap you again! He's being selfish at this time (and it seems previously as well), if he thinks he's the only one hurting. There are others who understand this less than he does.