Characters
You can't talk to my wife that way - who do you think you are?
— Movie Patron • The Purple Rose of Cairo

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker objects to the way someone is speaking to their wife and challenges that person’s right to do so. The question about who they think they are intensifies the rebuke. The line asserts a protective boundary, presenting the manner of address as unacceptable.
Context reviewed