I never realized there was a term to describe the low-effort phrases that people often use to get other people to shut up.

A thought-terminating cliché (also known as a semantic stop-sign, a thought-stopper, bumper sticker logic, or cliché thinking) is a form of loaded language—often passing as folk wisdom—intended to end an argument and quell cognitive dissonance with a cliché rather than a point.[1][2] Some such clichés are not inherently terminating, and only becomes so when used to intentionally dismiss, dissent, or justify fallacies.[3]

The term was popularized by Robert Jay Lifton in his 1961 book Thought Reform and the Psychology of Totalism, who referred to the use of the cliché, along with “loading the language”, as “the language of non-thought”.[4]