Y is X?

Journalists have used this (false)claim to imply that cultural group X has reason to spend a great deal of time thinking about the specific idea Z. This served as the first example and the idea behind the name of the trope or a type of phrasal template in which certain words may be replaced with another to produce new variations with altered meanings, similar to the “fill-in-the-blank” game of Mad Libs.

Examples:

X is the new Y

The only good X is a dead X

To X or not to X?

X is my middle name We’re gonna need a bigger X

X, X Everywhere

I, for one, welcome our new X Overlords

Bitches Love X

One Does Not Simply Walk into X

Keep X and Y On

X’ers Gonna X

A Wild X Appears!

In Soviet Russia, X Ys You

 

What was the claim and the trope?