I used to hear the same thing about my math degrees.  What are you going to do with a degree in math?  Don't you know there's a glut of teachers out there?

In fact, a few years back my nephew asked me to give a presentation to his high school math class (Grade 12 - basically AP) - in addition to having a PhD in math I'm also a qualified actuary so I could give them some idea of some of the things you can do with a degree like mine.  In fact, his teacher pulled me aside before I started and asked me if I could give them some idea of the sort of things that someone with a math degree could do.

So after giving them a much abridge summary of my career progression I listed off some of the other things that my various classmates had done.  Obviously a couple were high school math teachers, a couple were high school principals, one was a bank manager, two were doctors, three were lawyers, a couple were university profs, one was a computer hardware engineer, and so forth.