Except the car wasn't destroyed, it's actually flying out there - and maybe, one day in the future, someone will retrieve it.

(I could understand people complaining about symbolism of sending a sports car, of all things, to be a first private industry artifact in interplanetary space. But this doesn't seem to be a majority complaint.)

Also: even the boring test mass payload would also cost "years of many folks' income". Not even counting the integration. Big things just costs big money - that's life for you. If someone is so sensitive about this, they probably shouldn't watch anything related to rockets at all.