I think most folks think owning a Porsche says something about us (in addition to the fact we like our cars).
They're just not sure what it says: crazy driver? (I usually think of that when I see a riced-up car); rich and wants to show off? (gee, some folks I know fit that stereotype); likes really nice machinery and can afford it; not practical (how am I going to fit the kid's soccer team into that?); fun loving (awww); sexy (of course); on the make, perhaps in more ways than one; etc, etc.
So it is complicated. My other car is a Toyota Yaris (no joke) and sometimes I wish I had a bumper sticker for my Porsche saying that to take the edge off of people's imagination of who I might be and what I might be trying to say about myself.
Cars do reflect things we want to say about ourselves, but they're also things we enjoy for differing reasons. For me, my car is relatively cheap entertainment, fast and fun, and the source of hundreds of projects to keep me out of trouble. I also like the way it makes little kids point and wave
I sometimes try to relieve some of the guesswork when other folks comment on the car by asking if they've heard about the difference between Porsches and porcupines (pricks on the outside). That usually puts them off balance enough that their preconceptions don't get too much in the way.