Oh, I admit that Lex is also angry with Clark in that scene, and with good reason: Clark has, at that point, been an absolute bastard to Lex for quite some time. And, yes, Lex has envied some aspects of Clark's life, as I think he's previously admitted. But the "Vessel" scene in question -- as you've said above -- implies that Lex only ever pretended to be Clark's friend because he envied Clark's life, and that is clearly and laughably untrue. So I guess, in a sense, we agree...if only to a certain point.