Italians are an emotional bunch. I give them the accommodation.
The owner's interpretation of "screwed over" is that he probably had lost food or business to accommodate the cancelling patron.
Patron, on the other hand, is under the usual educated training that intent matters and can wash away actual loss.
The nature of the "Table Boston" business is that there is a considerable scarcity of seats. The establishment charges $125 for a seven course dinner. Seating is outlined as
SEATING:
32 communal seats
As such, the inference can be drawn that this is a high margin, low volume establishment.
Customers in general, are...very viciously unsympathetic towards restaurants and other similar small business. But, they are unintentionally and ignorantly so. Meaning they don't realize they cause harm, especially the educated who only did grunt work in a restaurant when paying for their college or HS. This on full display here.
Considering the "four corners" of the X(formerly Twitter) post, supposed victim customer did fail to post any reference to the cancellation policy of the restaurant or said seating limitations of the restaurant, displaying a degree of malice towards utter destruction of the business.
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However, the business should realize that no set of rules, policies, or contract can ever be absolutely enforced. If anyone uses the grounds that circumstances beyond their control, especially health, causes failure to perform an act, the credit card company will favor the customer for fear of enforcement or bad press against them.
Summary:
Restaurant owners were screwed over.
Customer did not understand the business and instead shows a malicious tendency towards destruction.
Restaurant owner should have "settled" for that one time because the unique circumstances of health and being out-of-state would not hold water.