I think that the reason that people think it is their business what kind of car you drive is because it isn't just affecting you and your family but the entire planet. I'm not going to get into an environmental debate here but I think some people are missing that connection. You don't have to agree with it and you can still tell those of us who are more environmentally conscious to go pound sand, but that is why we are concerned.
If that were exclusively true for only cars, then I'd tend to agree.
But since many other things use petroleum based products, I'd have to say that no, it really isn't anyone elses business.
Is it anyone's business as to how big your home is, or how much lumber it took to build it? Depleting forested area's is a big no-no. You're taking away a natural resource, as well as that little birdy's home.
Again, the size of your home...how much energy do you have to use to heat/cool it?
Do you use tupperware, or any other plastic containers? Plastic is a petroleum based product. You really should limit the amount of ziplock bowls you buy -- even if they are dishwasher safe.
Do you wash your car in your driveway? Well, in case you didn't know, that's a big no-no also. You use much more water by doing that than if you use the car wash down the street. They recycle their water and use it over again.
What kind of light bulbs do you use? If you're using anything other than the greenest bulb, that's a no-no.
My point is, unless you are perfect in all of these categories, as well as many others, it's hypocritical to judge someone for the type of car they drive. No one is perfect.
And please, feel free to judge me for my lightbulbs as well as my vehicles. I'll also give the square footage of my home as well as the number of tupperware containers I own upon request.