And yet here here we all are taking about it. Art is about inciting a response, and he’s done it. Whether we think he’s a hack or not is irrelevant - he has the world’s attention.
Gp said, "it's a hack"
You said, "Whether we think he's a hack", which fundamentally changes what is being discussed.
The only reason we're talking about this is because of Banksy. Not because it is a clever or "deep" piece. It's disappointingly surface level, and the fact that we're talking about that doesn't suggest otherwise.
Where does the "art is about inciting a response" theory originate from?
I went and looked at https://en.wikipedia.org/wiki/Theory_of_art but couldn't find it there. The "anti-essentialist" section is good, though, I think. It has Berys Gaut listing ten properties of art, all of which are nice-to-have but none of which are essential. Then if a piece ticks lots of boxes it's a shoo-in, but if it doesn't tick many of them you can argue about it.
Some of those involve eliciting some sort of response, but you could also have a decorative piece with this combo:
(i) aesthetic, (iv) complex, (v) meaningful, (vi) idiosyncratic, (vii) imaginative, (viii) skillful, (ix) art-shaped, (x) intentional
Which would be 8 out of 10, to which we could add "completely ignorable" and it could still be art. I don't see why attention-grabbing and provocation is important, and it certainly isn't sufficient on its own, plus it's irritating.