I think people have less respect for older cars, like our corollas, or 'Datsuns' as most old jap cars are seen as, to the untrained eye.
I used to have a really clean RX4, it was resprayed the original white and was pretty spotless.
I had just pulled into a car park and an old dude pulled in next to me and proceeded to open his door into my passenger side door.
I got out and stormed over to his car like a madman and yelled "what the f@$% do you think you're doing!? you just hit my car with your door!"
he looked confused/disgusted and said "what are you worried about? its only an old datsun!"
so i checked my door, there wasn't any damage, just some flecks of his paint.
Called him every F and C under the sun and he walked away.
More recently, a was sitting in my KE35 and watched as a woman smashed her trolley into the front of my car, she noticed i was sitting in it, so she looked at me and laughed!!!!
My bumper was dinged to start with so i let it go, but the nerve!!
I agree with what other people on here have said, your good car shouldn't be your shopping car, that's why i bought an XF panel van!