Movies
I have had people walk out on me before, but not when I was being so charming.
— Deckard · Blade Runner
Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker sounds baffled and a little wounded, insisting that people have left before, but never when they were being this charming. It's self-mocking confidence: the speaker believes the charm was working, which makes the walkout more comic.
Context reviewed