How do you know what his sample size was? I took what he said to be generalization about society, not a commentary on someone here. Frankly, I could make an argument all day long for what he said, although I doubt you'd want to read it. I could apply those statements to my generation as well (my experience alone in College level English classes of which I have minor in showed me just how bad it really is. Let's just say 8th grade grammar is a problem for most people in college, but the way our school system pushes flunkies through, it's a small wonder a high school graduate isn't prepared for college).
In any case, it's a generalization not a condemnation of every single person. There are intelligent well-written exceptions out there, but MOST people are dumber than tacks or the average IQ would not still be around 100 with 50% of the population LESS than 100 (which is Forrest Gump territory, IMO). Maybe I don't relate at 155, but the sheer stupidity and ignorance I see on the News every day in everything from people cutting off other people's heads based on disagreements over fictional belief systems to drive-by-shootings over "dissing" or other gang-related nonsense leads me to conclude that your average human being is neither bright or moral. Perhaps the IQ on MacRumors is a good deal above average and so one could get a false impression of humanity here, but try visiting some pop music or car forums and see how and what people post. You might just change your mind about people in general, let alone today's youth. In short, just because you can write doesn't mean "most" people can. Texting over taking typing classes doesn't help anything, in my opinion. Perhaps schools should be offering basic business classes (covering such basic things like doing your own taxes and checkbook balancing which it seems most people cannot or will not do) instead of geology. Your average human would get far more useful information for every day life there whereas hardly anyone enjoys studying rocks or uses it on a daily basis.