Art is in the eye of the beholder. End of discussion. Some consider smearing manure pies over the wall art and it is probably is to them, but some of us find it disgusting. Seriously who cares? It is quite obvious the term art is extremely subjective.
theres an academic definition of art, which i explained. Its not subjective. In academia there is a distinction between high and low art. Now lets compare the word class and compare the word art.
There is high class and low class. However some people use the word class the same way. You either have it or you don't. Which is completely deviant from the original meaning of the word.
i could(have) write(en) pages on the subject. Things aren't either art or their not, they all are, but there are different levels of quality, and messages.
ballet is an art, but nothing remains, martial arts, when you get a ba in any subject thats a bachelor of arts. Lying is an art