I think it's precipitated by the shift of the Web from an early-adopters world that is mostly exploring the idea of being online, to one where the property-owne

I think it's precipitated by the shift of the Web from an early-adopters world that is mostly exploring the idea of being online, to one where the property-ownership ladder has taken precedence. The idea of being a "serious professional" is entangled in that of "the personal brand" and thus in your identity being your property. But it's not just that: it's also that this property has some assumed virtuous pattern of development(in the sense of Aristotle), and something that is not that pattern is incorrect, and possibly threatening because it disrupts their preconceptions of what is right - and it's always a preconceived thing, young kids aren't afflicted by this. They'd like to take the content - because it's valuable - while protecting those beliefs, so an urge rises to lash out, dismiss everything, give "helpful hints" about what to do better, or call it degenerate, because changing a belief is hard within oneself.