Why is evolution a waste of time to learn?I need to argue this point not the opposite.

Most things you learn in school are a waste of time to learn in practical terms.  The ability to read enough to fill out a job application, the ability to print, the ability to do simple addition and subtraction; millions of people the world over and most people throughout human history survived with that much knowledge or less.

I read an article last year that said that the most useless bit of widely available knowledge is that a peninsula is an extension of a landmass surrounded on three sides by bodies of water.  Everyone is taught that in school, but does anyone really need to know it?  Would Florida or Baja Califonia change if we didn't have a word that referred to precisely that shape and teach it to every elementary student?

Evolution isn't something that you personally can control for the most part.  It's not something that is going to happen to you in your lifetime.  You can live your whole life--and many peope do--without understanding it.  Granted, a doctor, espcially an epidemiologist, needs to understand the evolution of infectious disease organisms.  And while I would prefer that a paleontologist understand evolution, how many students grow up to be paleontologists?

In the one aspect of your life where you could affect evolution, the ingestion of antibiotics for too short a time, causing bacteria to become immune to them, I think someone better educated than you saying simply that doing so, "Teaches the germs to tolerate the medicine, much like running short distances teaches your body to be able to tolerate running longer distances," is probably sufficient explanation.

Heck, Darwin got the most important job of his life without knowing a thing about evolution (joke).

It's very hard to argue, though, in favor of ignorance.  The knowledge of the difference between a lepton and a boson, between a descriptive and a prescriptive dictionary, between Jane Adams and Jane Austen; I don't use this knowledge on a daily basis.  But my cats, who get canned food twice a day, like to play with toy mice and practice the killing techniques they don't need to employ.  And I have my storehouse of knowledge that I can take out and play with, exercising the "muscles" of my brain.