Lexicon. Derived from this bit in Steve Martin’s 1991 movie, L.A. Story:

L’Idiot is the hot restaurant of the moment, and pronounced as if French (as one might expect from the apostrophe). The phrase is generally used when someone is being a dick.

“I see Congress has cut Medicaid spending.”
“Part of the New Cruelty?”

Interestingly, the New Cruelty also shows up with lightning speed in this deleted scene that featured John Lithgow: