Well yeah but something like this shouldn't be on a public road, the visibility would be terrible and it would be so easy to run over people or animals or small vehicles
People's right to their own personal joys ends at everyone else's right to safety and not being killed on the road (especially as a pedestrian, like you wouldn't be able to see shit in this thing).
Drive it only on private property and transport it in suitable truck? Fine
Just owning it says enough about one's personality for me to pass judgement. Same as people who wear camo, people who open-carry, and people who have a Trump sticker on their car.
I'm pretty sure that spare tire is only there for the joke. With off roading tires that large they are almost definitely bead lock tires which can be ran at very low PSI without risk of the tire departing the rim. On top of that the tread is much thicker meaning punctures have to go deeper before they cause problems and most of the time came be fixed by simple plugs.
Not to mention the logistics of changing a spare on a tire of that size. A bottle jack is completely out of the question and you wouldn't be able to use a farm jack safety with the body that high. Even if you could how are you going to get that wheel onto the studs when it weighs over 300Lb?