Having said that, it is the most straightforward expression of what many teachers actually believe (and what they won't say in public) about their students. It is non-PC. Hell, it's the kind of thing that gets teachers fired, if not run out of town on a rail. A short section of the post:
Have you ever wondered why colleges and universities have to offer remedial reading, writing and math classes?
The obvious answer is because your precious little gift to mankind is an idiot. That is the primary reason.
Sigmund, Carl, and Alfred stop beating around the bush after that salvo, and get right to the point.