The "reasonable person" from law is not an average or typical person. It's an idealized person who doesn't change very much over time because the concept is rooted in common law. The average or typical person can change dramatically as social norms and movements go, but common law moves very slowly by accumulation of precedent.

IMO, human nature has not changed, culture at large has not radically shifted, and the world is not coming to an end. This is just wide-tie/skinny-tie stuff.

But many people have said essentially the same thing, over the course of many years. I think there’s a moment for each of us when we realize that our worldview isn’t substantially similar to that of others anymore, especially younger people.