I didn't find anything wrong with his attitude really, but then I used to talk to Lex on a daily basis so my views on attitudes might be skewed some.
And if he's innocent and had nothing to do with Cas' disappearance then we're staking an innocent person. Now if he's Jerry then go to town. But we should probably have it confirmed that he even did anything. Right now all we know is Cas probably went to meet him.