[SilasX]

3 especially. Communicating the "why specifically" is what distinguishes you from the "don't get it" types and is less hostile than implying that he couldn't possibly understand the why.

I've been in many situations (though more about philosophical ideas than business ones) where someone would repeatedly insist that something I was proposing was wrong, and only by extensive research did I find out that the whole time they could have just said X, and it would have made sense. (Or discover that they didn't understand the field or idea as well as they claimed.)