Kiper took a deep passion, saw an opportunity, and made it into a career.
I don't respect his insight any more than I do most of the draft-niks, but I don't disrespect him either.
As far as being condescending... I don't see it that way even a little bit.
To the contrary, I think as far as I've ever seen it, for someone who spends a whole lot of time studying what he studies, he disagrees appropriately. He maintains a straight face and asserts why he believes what he does. If he were one to, instead, routinely back down instead of stand his ground, you'd have to wonder if he really believes anything he says.