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A security guard later helped Xie process the payment with cash, the report said.
This is, imo, the most important part of the article. If we want more payments were made without using cash, we have to realize that some people, elderly in particular, probably will never adjust to that. The security guard in question is a hero imo, and we need people like him in every store if we want the transition to be as painless as possible. Also, every place with a sign "We accept Bitcoin" have to be always happy to accept cash as well. Only this way we can avoid unnecessary hostility towards its usage.
I agree and I appreciate what the security guard did to his fellowmen instead of discriminating he helped him process the payment with cash. Such good deed will be rewarded and remembered. It would also be nice if there is another choice to pay for fiat as cashless payment may not be adopted by old or younger people that are not exposed with the so called technology that trigger a cashless society.