OP, i agree with you.
I would steal the short guy's car, set it on fire, and drive it into the shop. That way, he would have no place to return to work and you would exact your revenge..if a family member of his was trapped in the burning car, even better.
Or, i would find a new shop.
As others have said, test drives are normal after oil changes but my car never smells like burning anything after driving it hard. Maybe you simply smelled the burn off of some oil that leaked oil during the change?