I think this one has been discussed before, but I know that several of us have different interpretations of the scene in House of Luthor when Superman comes to Lois's apartment. She is wearing a negligee and hurries to put on a robe. Superman tells her that unless the robe is lead-lined, she might as well not bother.
My interpretation of that scene is that Superman was just being practical. I didn't read any ulterior motives (i.e. a need to humiliate her) in his comment, simply that her modesty was unnecessary. He knew what was coming and just wanted to get on with the discussion.
I know others think that Superman was being deliberately cruel. And honestly, I have no idea what exactly the writers had intended. I did always think it strange that Lois would wait for Superman in a negligee instead of her normal clothes, so any sarcasm in Superman's comment was deserved.
Lynn