Part of it may be that since wikipedia etc exists; you're "supposed to do your homework" before even asking. The idea that people might discuss things from and in a state of ignorance as a means of learning or even just social interaction, rather than from laziness ... that's not something most people think of. "Sophomoric discussion" is an insult now, somehow.
It's fun how often things that "everybody knows" are, once you get someone talking about them, not actually as well known and universally agreed as everyone seems to take for granted.