This happens to me. It makes me physically f'n ill - like my pulse goes up and I shake like I want to hulk out.    If I'm armed and in a place with people around, I'll call them out. Usually something subtle like Should I know you?, or Nope, Keep walking, or I'm not looking for friends. I've told off 1 or 2 because it happened at the right place {in mostly-white well-populated area} at the right time {not at night}. I've yet to experiment with doing overtly bizarre things like picking my nose at them, making disturbing faces, or replying to them in a demonic voice.    The people who fancy themselves brave enough to do something other than pretend to ignore it should step up. If people see one person do something about it they might be more likely to learn that resisting is an appropriate response. I say take this and run with it because it's protected by being a feminist cause. Say you got the idea from  www.ihollaback.org/  {liberal site} and not Stormfront.