Now, as much as you'd like to do to your coworker what he does to your ideas, let me suggest a different approach. Do like the Koreans and make him an offering instead. I'm not suggesting that he's an animal, but if you strategically toss him a few bones you may find that his skepticism turns to support. I've outlined some possibilities below. Disarming the Skeptic Serve up practical examples.
Skeptics love to sit in meetings and shoot holes in whatever's being said.
Much of the blather and bluster that goes around in meetings deserves to be turned into Swiss cheese. Dodge this problem by loading your suggestions with practical examples and testimonials. The more airtight your position, the less easily he'll be able to shoot it full of holes. Back up your arguments with hard data. Offering stories and testimonials will feed your skeptic's right brain.