No ones saying any phone cannot scratch. The Genius sure did a number on his phone with keys, AGAIN it didn't scratch it. Anyway, phones scratch, glass scratches. WE GET IT.
However, the iPhone 12 is MUCH more susceptible, to scratches from incidental, very, very light usage. Mine was never in a pocket with anything difficult, I don't have any of this magic sand in my hoodie that could have done it.
AGAIN my 11, XS, X, all the way down to 4S when I stopped = No scratches like this. I'm very careful (clearly by that record)
I'll take the guy who worked at a stores word over yours and his demonstration was pretty clear.