So that's where the mistake comes from. But it's an example of an error that shapes the relationship between fans and pros.
I would think most people think of Lex as a business man, schemer and scientist. Look at how he was in Smallville, for instance. And the recent version of Norman Osborn is about 20 years after Man of Steel, after all.
Seemed appropriate for this thread:
"You see, but you do not observe."
I think of Lex as a Mad Scientist. I remember when I saw the first Superman movie as a child and I thought it was weird that Lex was a Real Estate Agent. I still think its weird.