I don't think you're a douche, just under-informed.
hmmmmmm... thank you, maybe, I think????
You are correct though (I don't like to admit to not knowing something, or not having considered most of the aspects of something)
I once had a clerk at my local gas (petrol) station tell me "ya know, of all the customers i deal with, you look like you would be the biggest ace hole; but you're not, you're probably the nicest one"
"Uhhh, thanks, I think"