I can place it to at least 1964:

Infamous "little girl" attack ad by Nixon against Barry Goldwater

That right there is a cancellation attempt.

Interview with Goldwarer on it

Pre internet, this cancellation stuff was done in print or on TV. I still remember what the Republican party did to Pat Buchannan in the 1990s, who has been proven right about everything, and is owed a groveling apology by the entire Republican party.

I can place it to at least 1964:

Infamous "little girl" attack ad by Nixon against Barry Goldwater

That right there is a cancel attempt.

Interview with Goldwarer on it

Pre internet, this cancellation stuff was done in print or on TV. I still remember what the Republican party did to Pat Buchannan in the 1990s, who has been proven right about everything, and is owed a groveling apology by the entire Republican party.