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, on…
"Sophomoric" was never a compliment.
Isn't talking about, and exploring things that you're not an expert in, good, rather than bad, as that's how you learn new things?