I still don't see the connection between a fondness for reading YA or kids' stories and a lack of interest in self-education. I'm a middle-aged woman who spends way too much time playing computer games and who just re-read the Harry Potter books. I also just read a memoir about an obscure historical event, have Science issues sitting on my night stand, and spend a lot of time on and off the web reading about history, sociological issues, and science.
I can't even say I generally read the "edifying" stuff expressly to be better informed (aside from specific articles I notice that might be useful for teaching college bio courses). I just find it interesting. And sometimes something I run across in a work of fiction, even SF and F, will lead me to research something historical, sociological, or scientific.
This is anecdotal, though, and it's impossible to extrapolate this to the population as a whole. I rather suspect that the people who are most poorly informed and who struggle to keep up with reading assignments in college aren't people who have read lots of "pulpy" or YA fiction for fun, but instead are members of the rather alarming percentage of people
who never read for pleasure at all. One thing that is interesting is that younger adults are actually more likely to read for pleasure than older adults. This runs counter to the "kids these days are too busy playing video games and fiddling with social media to read
books" argument.
[edit] and boy, I just checked the original post, and this thread really has strayed a bit off course, hasn't it? The point, still, is that not liking a particular piece of fiction is fine, but that doesn't mean there's anything wrong with other people liking it.