The 2nd level of Banksy’s pranks is how angry they make self-appointed arbiters of what is counter-culture or cringe.

Banksy is the Taylor Swift of art. Mainstream and banal, but with mass market appeal. Both have talent, obviously, but do not create anything profound or original. I'm aware of both through cultural osmosis, but mostly indifferent towards both - I'm not sure how you read anger from my post.