Is this considered rude?

There is a local guy with a beautiful dart sport with about every option you can possibly think of, sunroof, vinyl top, four speed, 360, front power disc brakes, buckets, sure grip, etc.....beautiful car.
The guy sits behind the car with the most sour look on his face.
Every time I see the car I just start drueling it's that nice and I always compliment the guy on his car and not once has he ever said thanks, eff you or anything.
He just watches everyone like a hawk when they get near his car.
He won't move from his chair and just sits there as if his car is the only car there.

How fun is that?

I finally gave up trying to be nice to the prick and it's funny because I have had several buddies go look at the car at different times and they all come back with the same reaction that it is a really special car but the owner seems like a real paranoid jerk off.