Here's what I sent the guy:

"Hi. I'm going to guess that you're not really a pilot and you found the uniform at the thrift store and thought it was cool. But, if I'm wrong, and you really ARE a pilot, and you're stupid enough to post such a thing at Craigslist, I'd be happy to make it my goal in life to see you lose your job. We don't need people like you in the biz. I found this link at one of the more popular airline pilot forums. Your pic is making the rounds. If anyone knows you, you are so ...... .