The dropbox icon keeps reappearing in my finder toolbar, no matter how many times I Command Drag it off, or remove it in customize toolbar. How can I get rid of this annoying button that keeps coming back?

The solution in this one answer does not solve my issue as the button is removed, but as soon as I open a new finder window it is back. I am running OS X 10.10.2 (14C81f) with Dropbox 3.0.3.