This also extends to the ways information about Aincrad seems to be circulated in the real world, because it does so in ways that I absolutely can't imagine actually playing out that way IRL in the 2020s.
In Phantom Bullet arc, during the scenes of Kirito's friend group watching the tournament stream from inside ALO, it becomes very explicit that the existence of the Laughing Coffin guild is NOT information known to anyone who wasn't there. Suguha, one of the non aincrad survivor characters with MOST INCENTIVE to absorb as much information about aincrad without having to ask her friends about their trauma, has no idea what Laughing Coffin is.
In general there's an implication that what happened in Aincrad stayed in Aincrad, that the only way to figure out would be to personally ask someone who was there at the time.
I find this incredibly hard to believe. I'm pretty sure that in this situation one of the first things that would happen is that people would interview as MANY survivors as would possibly agree to give statements, and many survivors would probably just make AMAs or something on their own. This would become Content, because that's part of how we deal with huge events in the modern social media era.
Kazuto being just a normal guy in the survivor school is at least understandable as part of a collective unspoken agreement that what happens in aincrad stays in aincrad. Because otherwise it seems bizarre to imagine that he just hangs out with people his age in class and after it and they call him kazu and are friendly with him when EXPLICITLY they all know he was The Guy Who Ended The Game and also before that he was one of the most hated and ostracized people on Aincrad.
However, again, I can buy this not causing friction, guilt, or resentment from either Kazuto or his peers BECAUSE the school is a space that by definition exclusively contains survivors AND is organized around getting those survivors back on track for normal social life and giving them back the school years they lost. everyone on some level probably kind of understands that this is not a space to relitigate or even acknowledge what happened in aincrad, and in fact the space is ONLY bearable is everyone on some level deliberately compartmentalizes like this, for much the same reason that people inside aincrad treated talking about the real world as a taboo.
So this is a model that works within face to face Aincrad survivor communities, but it CANNOT be expected to hold in a broader online social context.
Early in Alicization (as in, in the one prologue scene before Kirito gets put in a coma and wakes up in a military experiment) it's mentioned that there's s book out that's a dramatized recounting of the events of Aincrad and Kirito for obvious reasons features prominently. They ONLY bring this up as a way to dunk on Kirito because of how cheesy the dialogue they gave him is.
This... seems insane to me to imagine this could be published and taken this lightly. First of all it's insane to imagine that a physical book published over a full year after the end of the incident would be the first or defining account of it because, again, there would be content mills digging every single survivor statement and amateur documentary style YouTube explainers within the week.
And more than that, the way it's framed is almost quaint. oh, kirito, the public perception of your aincrad identity is too cool and it's innacurate, this is a funny and embarrassing detail about something that concerns you, but doesn't actually affect your day to day life in any way that would make this a serious thing rather than something to poke and tease you about.
Like, even if we accept that Kirito is a type of guy who would not have public social media (most likely this would be the case post sao, but again, it would have to be a decision in a way it isn't really in the text), this ABSOLUTELY would affect you psychologically because this CANNOT be assumed to be just a niche thing, especially when Kirito continues to play VRMMMOs with the same username and playstyle. It's not like he Only interacts with survivors, even if most of his actual close friendgroup is just survivors.