Not so. It is possible to talk in relatively concrete terms about our reactions to a specific piece or body of work, whether we like it, etc, without ever once trying to define what "fine art" means or whether the work comes within that description.
Re the OP's question, I do not think that it is possible to give any useful definition of what constitutes fine art. Almost everyone defines it differently - I can call anything I want "fine art". You may disagree with my choice, but so what? Who are the art terminology police?

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