Why do people need to hate on us for having a 4wd?

I asked a question of if we should have a landcruiser or a prado, we already have a landcruiser but I am thinking of changing, and I get negative answers about being a gas hog etc. I care about the environment a lot but we live in the australian outback and we need to have a 4wd as it is safer for hitting into cattle and kangaroos plus we drive for 14 hours and have a car seat in the back, another one to add in december AND two dogs (plus suitcases and shopping!) I get why people don't like 4wd's in the city, but why do people automatically ume that other people live in cities anyway?