I'm surprised people haven't seen the irony of that scene at the party.
Bruce and Clark are staring each other down, maybe they suspect who each other really is, or maybe they don't, but they obviously don't like each other and as Batman and Superman they see each other as their biggest threat.
And then here comes wacky zany Lex Luthor, the goofball billionaire whom nobody...including these men who are too busy staring each other down to even pay him any attention...would suspect could be dangerous
Lex has his 'mask' too, and he's wearing it in that scene. Bruce and Clark are too busy hating on each other to notice him and I suspect that's how it will all play out in the film...Batman and Superman at each others throats while Lex happily hatches his evil scheme right under their noses.
Anyway I'm loving everything I've seen of Jesse so far, and I most definitely don't think we've seen everything yet...I mean do you think once his plans start going down the drain he's going to be all goofball?
Of course not, we'll get 'menacing Lex' when their is a reason for it, but right now everything is going according to plan and Lex is just having a blast pitting Bats and Supes against each other.