Why don't my teachers improve themselves?

I cannot complete some of my CS university courses because most of my teachers are incompetent, their speeches are incoherent, misleading and more often than not flat-out wrong.

Even the best hackers on this site could not pass my exams, because the correct answer is not that you'd expect -- it is always the misbelief the teacher heard about years ago.

We have the Linux-fanboy who keeps joking about how Windows is not scriptable (PowerShell was released in 2006), the OSX-fanboy with his anti-Microsoft pet peeves...

Another teacher disapproved my home work because the results were different on his machine. It was a benchmark you idiot! Of course the results are different!

We are presented facts that became untrue a decade ago. They all go into OS flame wars, language syntax flame wars and the like.

Yet we are looked down so much, the whole atmosphere becomes so dragging, I'd rather just stay home and code.

I recently realized I attend classes only to socialize a little before and after the course.

Is this a problem elsewhere too?