I did not see mention of the year of the vehicle. A 370Z is not necessarily a rare or expensive vehicle. There might be something there, but a 370Z is not in itself anything to cause me to raise an eyebrow.
No, it’s not an exotic supercar, and yes, young people may go into hock to drive nice cars. A middle class couple (two incomes) is one thing, but it does seem a bit upscale to me for a restaurant assistant manager. If its an older Z he bought used, sure. If he has a couple jobs and lives with his parents? Sure. If it’s newer and tricked out and other aspect of his lifestyle seem a bit extravagant? Maybe not. Like I said, at least something that deserves at least a cursory glance.