Yeah, how dare a customer expect you to not damage their property. And as we see all too often, have the shop lie about it. It has happened to me, also. The nerve of some customers! It's so much easier sending customers somewhere else rather than doing work the way it should be done.
Obviously you did not read the post. We have replaced a wheel that was damaged on the balancer without needing the customer to point anything out to us. We are professional and know how to do our jobs without the average guy telling me how. The last person that "knew what he was talking about" spent $2500 for me do fix his car his way before he listened to our original diagnosis. There are plenty of reliable customers that don't hassle us and they get great treatment in return. Anyone who knows better and feels the need to talk down to a shop before any work has been done should probably invest in all their own personal equipment and do the work themselves. Again all that is needed is a simple please don't scratch the wheels. Then if something is harmed bring it up. But talking to someone like they are incompatent and threatening that there will be a problem if they get scratched is a great reason for me to not want you as a customer.
My recommendation for those that want a good experience and aren't going to be a pain to the shop is to find a small reliable Indy shop that has low turnover on technicians and has been open a while with a good reputation. This way shows they typically treat your vehicle with respect. Most "discount" tire shops pay a very low wage a a commission per tire. In which case the tech has no incentive to be carefule just to crank out as many as I possible to make a living (again there are always exceptions).