Truth is, not everyone knows/cares about cars.
To people who don't know/care, it's just a Nissan, and a big one that only has two seats. It's expensive, it's loud, it's thirsty, and the boot isn't very big. To non-car people, it's actually not a very good car at all, especially to those who just use a car as an A-to-B device and need somewhere to put the kids and shopping. It's an unnecessary and flash expense in a world where money is tighter than it's ever been, and it's polluting the earth and killing trees. This is why people give disparaging remarks mostly, not because they're jealous or because they're arseholes, but because they don't feel the same way we do. It doesn't make them wrong (arguably they're correct on all counts!), it's just a difference of opinion. To turn around and start slagging them off and calling them stupid makes us just as bad.
We love the cars, it's our money we're spending, and that's all that matters.