Any performance car is at risk of abuse by others, including your own family, valet parking attendants, and certainly service centers. These incidents are very common. I'm totally over the top when it comes to my emotional attachment to my cars. With that said, I would let go of any premise that you "deserve" anything here, as its impossible to quantify any harm that was done (probably none in my view). I think its worth showing the service manager the video as that tech is a liability to the dealership (Michigan notwithstanding). I'd add too this is not the expectation of care you expect when you leave you car and until there are procedural changes, you will no longer bring your vehicle in for service. We all know service is a huge portion of dealer revenue.