I agree, but they won't change their behavior if they aren't called out on it, or at the very least having it pointed out. Sure maybe only 1/10 will actually have the self-awareness to go "hmm, they are right, maybe I should alter how I approach my online persona and conversations with people to be more constructive" but we have to at least try and keep the online conversation world civil and on point.
I'm very aware that there are some people who just want to "win" at the internet, so much so that even when they are directly called out on it, they don't even acknowledge the criticism from multiple sources. (not referring to here, but another forum I used to visit regularly , and a guy who is infamous for that behavior, to the point where his name is now a verb for dickish online behavior there) That's not good behavior, and it shouldn't just be ignored. All I can do from my computer, is try and point out when someone is behaving in a way that might benefit from improvement. Because if nobody calls them on it, they won't ever even consider that it might be wrong behavior.
Now that online behavior rant isn't specifically due to the "opinion vs fact" issue that started this quote conversation, though that is a part of the larger online behavior I am talking about. In general, most people are reasonable, relatively balanced on the internet, but a subset are not, and it doesn't take them long to totally devolve a pleasant conversation into a toxic cesspit that has to be locked down by the moderators. We all know this, we've all seen it, but we don't have to just accept it. Sometimes it's just due to the inherent margin of error in online communication that happens when you can't hear the tone or body language of the person you are talking to, so you project emotions that just aren't there. I've had this problem for years, where people would assume I was being rude or confrontational, when I wasn't, due to the way I type. Specifically.......this........ for YEARS, I would use that in chat, just to denote a pause in speech. Like "i'm thinking about the question presented" or "i'm befuddled by what was said, and trying to convey confusion" and other things. But apparently, at least on that chat server, it was commonly assumed that "....." implied attitude, and sarcasm in the reply. So I had a reputation of being something of an asshole on that site I visited daily, and had no idea, until one night somebody blew up at me and I was like "ok where the fuck did that come from?" And the other people told me "the way you type comes off as a smartass." to which I replied "....how? " and they were like "SEE?! You're doing it again!" So now I try and curtail my use of ..... , so that I don't repeat that. I also make a point to slap disclaimers around comments I'm going to make that are often misconstrued to be direct statements at someone, or might be interpreted as fact versus opinion.
It also frequently happens if you use the word YOU when discussing something that is a heated topic. Even if you are using it in the third person context (like I'm doing now), people will often assume that you are speaking directly at them. And then they're like "I never said I thought *insert issue* you're putting words in my mouth!" which is followed by "I wasn't talking about you specifically!" and it's just a gateway for a downward spiral of discourse.
And frankly, after decades of seeing it happen, especially over topics that are ultimately meaningless (like most of the entertainment issues on this site), I grow weary of just accepting it as "part of the online world". Well I don't think it has to be that way. That we can behave like adults and try and help each other out when communicating, to limit the amount of misinformation and hostility we generate, that is then archived for all of time. Maybe it's ultimately futile, but it's not going to stop me from at least trying.