Thought Reform and the Psychology of Totalism” popularized the term “thought-terminating cliché”. A thought-terminating cliché is a commonly used phrase, sometimes passing as folk wisdom, used to quell cognitive dissonance. Though the phrase in and of itself may be valid in certain contexts, its application as a means of dismissing dissent or justifying fallacious logic is what makes it thought-terminating.

Thought Reform and the Psychology of Totalism - Wikipedia, the free encyclopedia

The thought terminating cliché (“I just want what’s best for the user,” “Your privilege is showing,” “Fail!”) is a hallmark of Internet discussion.