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Well, you know what they say: if you don't have anything nice to say about anybody, come sit by me!
— Clairee Belcher · Steel Magnolias

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
A wry twist on the familiar advice to say nothing if you cannot say something nice. Instead of urging silence, the speaker invites anyone with unkind remarks to join them, cheerfully presenting shared criticism of others as a welcome pastime.
Context reviewed