Most people don't like to own cars. Pay, insure, park, repair. It is just necessity to move from point A to point B.
Move higher up and "personal city on the moon" becomes the status symbol. Move lower down and it's still cars. What type of car, and what modifications it has, etc, become quite important talking points.
A recent SMBC seems to me to explain it well: https://www.smbc-comics.com/comic/esteem-2
The bonus panel is hilarious!
And the more you customize your truck, the "higher" your status. To the point where you get ridiculous monstrosities like this https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcTCPjEi.... There is no point to this besides to declare ones status.
Hell even closer to your bubble of private jets and yachts, plenty of high net worth people collect expensive and rare cars. It is a major status symbol to say they have 1 of 500 La Ferraris made or 1 of 375 McLaren P1's.
For what it's worth, I live in the Deep South and while I do see bumper stickers of that sort every now and then, the sentiment behind it is generally just banter. Most people with one probably have three or four identities more important than "I'm a Dodge guy", whether it be "I'm a Christian", "I'm a father", or what have you.