The "what is real news?", "truth isn't truth!", "it's impossible to know anything for sure, so nothing can be said to be true or false!" arguments are kind of played out these days.

https://www.washingtonpost.com/politics/2018/12/11/truth-isn...

Giuliani: And when you tell me that, you know, he should testify because he’s going to tell the truth and he shouldn’t worry, well that’s so silly because it’s somebody’s version of the truth. Not the truth ...

Todd: Truth is truth. I don’t mean to go like ―

Giuliani: No, it isn’t truth. Truth isn’t truth. The president of the United States says, “I didn’t —”

Todd: Truth isn’t truth? Mr. Mayor, do you realize, what, I, I, I —

Giuliani: No, no, no —

Todd: This is going to be a bad meme.

Giuliani: Don’t do, don’t do this to me.

Todd: Don’t do ‘truth isn’t truth’ to me.