The problem with vegans is that there is a small but extremely vocal minority that absolutely, positively just HAS to incessantly preach about it and try to belittle everyone else. As a consequence whenever someone who has heard about militant vegans immediately associates veganism in general with them exclusively simply because non-insane vegans (which I believe are the very large majority of vegans, though I have no data about it) are woefully underrepresented in the public consciousness of veganism.