Duke, I see your point, but think about this.
I don't let anyone drive my vehicle. I don't valet. I don't carry food inside the cab because I don't want odors. I carry my knife on my front pocket, not the back, so as to not make a tear on the leather seat, nor rub my shoes on the metal threshold to keep it pristine.
For the same reason, I don't wear grease or stained clothing, (like mechanics do), without a seat cover. I watch where I park, so my doors don't get dinged. Do you think these yahoos will treat the vehicle the same way you or I would? I know they won't.
We don't know his truck was damaged or not, and this is not considering COVID, which having more than one person, exponentially magnifies the risk of contagion. He could have it now and not know for all we know.
So yeah, it's pretty ****ty what they did and he has every right to be pissed, as would I.