Characters
If she’s a lady, then I’m a Vermicious Knid!
— Grandpa Joe · Willy Wonka & the Chocolate Factory

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker rejects the description of a woman as a lady through an extravagant comparison with their own identity. Rather than arguing the point directly, the conditional sentence makes accepting one claim depend on accepting another unlikely one. Its force lies in that sarcastic pairing.
Context reviewed