Wonder what sort of class he has in mind?
Film? Language? Either way, I tend to agree; many people on the Internet - fans, especially - have a lot to learn about the subjects they claim authority in, and even more to learn about presenting a good argument. Most of all, they need to learn the difference between opinions and facts, as well as semantics - I've seen way too many arguments flare up simply because the people involved don't bother to comprehend what they read or what they say.