This is my perspective on the "is graff art subject", it might not be logical or make sense but bear with me.
I believe that graff is art, from big pieces to little tags. The pieces are rather self explanitory, but as for tags/handstyles, whatever, I place them besides caligraphy which is a known art form.
I also believe that theres alot of hate for graff cause of the "political propoganda" that is surrouding it. Since the day the majority of us left the womb weve been bombarded with different types of advertising attempting to sell us shit we dont need. But as soon as any writers attempt to break the system and advertise in their own way it gets frownded upon. Graff (even etching/scratching) is heaps better than all that advertsing anyways