How to be an asshole

I recently wrote a short analysis piece for work, which I then sent around to many of the folks who I'd spoken to in writing it. One such fellow had been the public relations person at a firm where I spoke to several employees. He'd been highly suspicious of my motives and clearly had no interest in helping me get the right answers, judging by his prior demeanor and his response to my request for comments:

Thank you. It appears your key points are wrong and the sources used/identified are uninformed.

P.S. I'm a dick

(postscript added for emphasis)