Cells phone cause brain tumors?

So I was at Macy's today shopping for shoes. I was on my cellphone tracking down Michael who seemed to be lost in the store, as this one lady goes up to me and says "Not so close to me". I'm like, "Excuse me?". Then she goes on this rant about how cell phones cause brain cancer/tumors. And how dare I go close to her with my dangerous cell phone waves. I told her that it wasn't a proven fact that it was true. Then she goes on and on about cell phones and brain tumors. I then, tell her that I'm a nurse. And then she tells me that I should know better. Excuse me!? I should know better. Seriously. I was seriously pissed off by this for some reason. As I was walking away, I could hear her saying that nurses and neurologists are all gonna have brain cancer one day. I turn around and just give her a nasty look. To top it all off, I was just standing in one spot talking on my cell phone, and she comes closer to me, because of where the shoes were. How crazy is that!? There are some crazy people out there.