I will use an absurd example of this frustrating (sometimes) comment.
Poster 1: The Rams will trade Jared Goff for 3 #1s in before the draft
Poster 2: You are crazy
Poster 1: I think it will happen, it's what trade Les does
Poster 2: Where did you get that from?
Poster 1: Well, just you wait, I am sticking to my prediction
Poster 2: It's absurd
Poster 1: Well, let's agree to disagree
Poster 2: What?
Sometimes it does end a conversation well, when there is an honest disagreement on two reasonable points of view. But other times it's just words meaning that some people (no one specific, recent posts notwithstanding) just are not interested in getting to the bottom of things and learning the game
All of us need to learn a lot, no one knows enough. But if simply engaging in debate gets people upset, what is the point? We had recent long-term poster leave because of certain things. Not this, exactly, but tangentially related.
But agreeing to disagree does not elevate the absurd to reasonable in my opinion.