I'm not sure if you are responding to me since you didn't quote me, but that is kind of the point I was making. People assume the way they view the world is the norm and when justifying/defending that there is often a lot of over-generalization and lack of nuance. It seems to me that when people are talking about what they perceive to be their shared experiences that an authoritative tone would be natural (although not necessarily correct) and that it's not just old-school gamers who are guilty of it.The issue isn't that they talk about the old days. Its that they present the old days in a way that over-generalizes from their own experience and do so with an often authoritative tone.
Those of us who played in the early years of the game didn't have the benefit of the internet and the shared community it can create. We can only rely on our personal experiences or spend a ton of time many of us don't have looking into all of research and study into the hobby that has emerged recently.
Maybe the issue isn't just the over-generalizations and authoritative tone of older gamers but also the younger gamers ignoring of the principle of charity when listening to those who started gaming when AD&D 1E or 2E were the standard.