What does Hancock not like to be called?

Hancock, the superhero in the film of the same name, dislikes being called "the White Knight". This is because he feels it's a derogatory term, implying that he's some kind of pristine, perfect hero when he's actually flawed and often behaves badly.

He finds the title ironic, as he's more akin to a "black knight" due to his gruff demeanor and troubled past.