Consider the source: another way of saying that any information recieved from a certain source can't be taken seriously because that source has been wrong before, or lacks credibility.

Joseph Lee Blast has zero credibility as he is a professional denier as evidenced by his involvement in the denial of smoking causing cancer.

I guessed you missed school the day they read the fable, The Boy Who Cried Wolf. It's not too late and it is an easy read even for pilots.