I'm thinking he has blower envy. I know some people can be gruff, and I've seen the tempers on others.
Sorry to hear(and see) that you have suffered at the hands of some of these characters. I can see how they may not believe somone with your credentials would have a Saleen, not to say that there is real doubt in anyones mind.
I might be time for you to hit the road in that thing. Personally I won't believe that you have it until I see it pulling up in front of my house, (hint hint) because you can do amazing things with Photochop these days.

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1997 Mustang GT "The Freak" - 13.80 @ 101.70, 2.07 60'
1995 Honda VFR750 - not much @ really fast (actual data pending.)
1964.5 Mustang 289
Rice Haters Club Member #13