i must admit yes i do judge people by what car they drive, not so much how they drive it though
for example, someone racing around in a 106 with a massive exhaust, i will judge them as a chavvy boy racer. got a couple of mates who have pimped 106s who do a lot of racing so that might be what leads me to that conclusion
steriotyping has a lot to do with it i think, and who you know who has that car etc they all influence your opinion