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You would need three promotions to be an asshole.
— Toomey · Biloxi Blues

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The line exaggerates an insult through the language of workplace advancement. It says the person would need three promotions merely to reach the status of an asshole, placing them below that level already. The mismatch between career progress and rudeness supplies the joke.
Context reviewed