I don't need a selfie stick because it would be just one more thing to carry around, like reading glasses or a water bottle, and at least those I can carry in a pocket or on my belt. Besides, I already know what I look like, so why would I need to take a picture of myself on short notice?
However, I don't object to someone wanting to look like a doofus carrying around a walking stick with their cell phone on the end. Different strokes, and all. Just don't stick it into my face, please. That would not end well, I'm afraid.