I think it's a bit of both. At the least, he rationalizes his hatred of Superman as mistrust of the alien's motives, and espouses this to those who'll listen--and in his internal monolgue, as in JLA #15 or somewhere around there, and (generally? often?) when he's written by Morrison. Also: "Obscene alien parasite!"But yeah, the DCU public is retarded, or else buys into Lex' paranoid ideology regarding superhumans, or both.
I don't think Lex's attitude toward superhumans is motivated by paranoia so much as egomania. He can't tolerate the notion that any being could be superior to himself in any way.

But, sure, he's a total chode.
Admiral Young said:Lex is once again in charge of LexCorp. Paul Cornell has been writing an incredibly awesome Lex in Action Comics.
I have been meaning to pick up the Lex-centric Action Comics issues of late. Thanks for the reminder.
