That's a bit of a chicken and egg problem. A lot of the modern preference for cars, can be traced back to marketing campaigns and legislations that butterfly effected the current cultural horniness for the automobile into existence.
You'll find car enthusiasts everywhere, sure, but not everywhere is built for nothing but.
I think they're commenting about the size of cars as a reason they don't like 'em. Sort of like saying "I manage a football team on Xbox but won't go buy a $3.5 billion franchise." The average car weighs about two tons though. At least according to the first Google result (avg car weighs a bit over 4k pounds).
It's mainly just used to highlight something they find absurd about cars, which is a fair opinion about cars when considering the weight versus other modes of transportation. Obviously they can't do everything a car can do, but it's a fair consideration.