Perhaps you should watch it again.
To offer some background, early in the movie it shows a small town low brow hs quarterback who gets his injured nutsack saved so he can go on to sire a ton of equally stupid dead end kids with trailer park honies feuding over him and how they propagated to the max while an edumacated nerdy city couple too busy with their PhD careers to have children finally try to get around to it in their late 30s but can't, thus the world is taken over by - wait for it - idiots and them smart folks become extincticateded.
Science has focused on nothings like treatments for erectile disfunction and baldness and that is the end of advancement in that field and tech.
Also, corporations have taken over to the extent that even drinking water is replaced by Brawndo, a Gatorade type drink, and people get college degrees at Home Depot.
Last but not least, FOX News - as seen in the above pic - is the ONLY news, and the mental level is kinda like a caricature of it today to the nth degree on roids.
- Oh, wait, that guy isn't a creepy late 50s brunette and she ain't a silicone busting late 20s blonde, so, um, guess I was wrong then! It IS about [WARNING: THE FOLLOWING MAY CAUSE RETINAL DAMAGE AND PTSD] CNN and the DEMONcratz,,,