In most incarnations Lex Luthor hates Superman because he believes that Superman is holding humanity back. In his eyes humanity became soft and lazy and too reliant on Superman so much so that they stopped aiming for the stars. He views Superman as a threat to humanitys future because of that. There is also jealousy involved but this is his rationale. So if Lex were to be teleported to MU, how would he feel about mutants? Would he hate mutants similar to how he hates Superman or would he think mutants are the true potential of humanity? I feel like seeing Storm bringing rain to drylands would invoke hate and disgust in him similar to the one he feels towards Superman.