The ethics of invective

"For example, it is not detraction to point out that a commentator
well-known for his opinions about some topic (political, scientific,
philosophical, theological, or whatever) in fact is not competent to
speak about it and that his views have little value. Even if this
damages his reputation, there is no sin of detraction, because no one
has a right to a reputation for some excellence that in fact he
lacks. It can even be obligatory for those who do have the relevant
expertise to call attention to such a person's incompetence, lest those
who don't know any better are misled by him."

https://www.catholicworldreport.com/2025/01/28/the-ethics-of-invective/