Honestly, its a mixture of jealousy and the unexplainable. Its the same reason why I have had turbo subarus speed off in front of me, 5.0 mustangs drop their clutches, and mercedes owners telling me how their "S" cost more than my "S". The latter is mostly the unexplainable, because in truth I was admiring his car.
Its not going to end or go away though. In 1997 I owned a little red viper RT10. The only people who said nice car were my parents, friends, and kids on school busses. I heard it all... american piece of cr*p, nice dodge, is that the new neon... however to their ever-dissatisfaction, I was enjoying myself too much to be concerned with them.
The viper became uninsurable on my policy (dont ask

) and I was shopping for boats, so I traded in the viper in 2000 and bought a boat and the boxster. The carrera cab and a 35' boat was a stretch for me at the time, and I wanted a convertible toy car. So the boxster it is. Since then, I feel like I've heard "so you got the cheap porsche" once for each of my 20k miles. Cheap to whom? I bought every option outside of customization and the tiptronic that porsche had in 2000, even the umbrella! The sticker was definitely still an undertaking. If you find that to be "cheap" god bless you and may your good fortune continue. But again, I found that this comment often came from people who couldnt afford the car in the first place, despite the fact that they somehow found the car to be priced "cheap".
Oh well, people will never change. Enjoy your porsches everyone, and love the fact that you dont have to be jealous of those who own them