Movies
Who is this person that speaks to me as though I needed his advice?
— Longshanks • Braveheart

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
An indignant rhetorical question. Asking who this person is, as though advice were an insult, shows how little the speaker expects to be instructed. The disdain lives in the phrasing: the adviser is treated as an unknown nuisance rather than someone worth answering.
Context reviewed