You cannot untangle the semantic argument about "What is Art?" from the discussion of the Art world as an institution and the mythos they have attempted to build around the word, because ultimately the only reason you care about whether something is ART or not is because you've bought into the Art institution lore that Art is something inherently valuable and impressive, a mark of great culture and the trappings of high society. If you weren't enthralled by that idea then you wouldn't care about that three letter word. That idea has been implanted in you by people and organisations who have benefitted from the strength of Art as a brand and so any intelligent discussion on this topic should pivot to discussing Art as an institution