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Many of the people that say this appear to have crafted this counter over years of dealing with disagreement. Having been confronted with a fact-based argument they couldn't refute in the past, they simply insist on the facts being presented to them concurrently, probably knowing that most arguments are far too complex to be communicated succinctly in a comment thread. When their opponent becomes angry and ignores them, they feel vindicated. They never realize that their inability to accept facts in evidence is the real problem, not their opponent's argument. That their opponent will not spend the time to hold their hand and lead them down the path to revelation somehow proves to them that they are right.
I have tried copying and pasting entire articles to comment threads in the past, and the resultant wall of text is then dismissed as Too Long; Didn't Read (TL;DR) I dismiss long, rambling walls of text (like this one) as TL;DR myself, so I get it. But that doesn't make them (or me) right. It means the reader isn't interested in the subject or interested in (even afraid of) changing their mind about whatever it is. I think this is the most common answer. They are bored. They really aren't interested in the subject being discussed.
Now, imagine what the response would be if the bored person typing TL;DR really needed something, let's say their air was poisoned and they didn't believe it. They'd be dead before they figured it out. Or the other way 'round. What if they needed someone else to do a completely routine thing (like click a link and read a counter-argument) and the responsible person just couldn't be bothered. "Why yes, I can see that you are bleeding out, and you need me to apply pressure to that wound. But I don't want my hands to get all icky with your blood."
If you are wasting time on the internet, reading a well-crafted counter-argument is probably the best use of your time. You learn what your opponent thinks. You learn what your arguments weaknesses are. The most frustrating thing is knowing you have the facts on your side, and the emotional believer of the contrary won't even look at the facts for fear they might have to change their mind about something. It's those kinds of people that make me despair for the future.
Politics and religion. A majority of people will not think critically about either one. Now that the Republican party has merged the two into one, becoming the party of Christianism, wanting to establish a christian nation, they think they've combined their strengths when they've actually multiplied their weaknesses. Like the person breathing poisoned air and doesn't believe it, Republicans are blind to the threats they refuse to see. Here's hoping they don't take the rest of us down with them.