The implied message is that students are becoming stupid, the level is going down, and the curriculae are based on a liberal ideology (the 2000 one). When I said "this kind", I should say "the exact same" joke twenty years ago, that my grandfather, a college professor, had as a photocopy. It missed the last one in Spanish, but did end with the "liberal/ left wing/ bleeding heart reference".
The last one is "A logger sells a truckload of lumber for $100. His cost of production is $80. How many tortillas can he buy?"
There are indeed evolutions in education, fashions and fads, but saying it's going downhill (and usually cutting down on financing) has been a fixture of our various governments. The self-fulfilling prophecy stuff.
So, IMO, humor can also have messages. I'll stop there, this is the Games and Humor forum after all, but I just wanted to say that this joke is old, and the 2000 and 2006 things make me cringe.