I've been fortunate, only middle-aged men have glared at me, no one has taunted me (yet).
Part of my job is to understand people, and "read between the lines" of what they're saying/doing in order to find out what it is that they need, and then (if possible) provide that need.
I think most people are simply reacting with fear (which is read as "hate"--hate is a better form of fear for them than merely cowering in a corner), and that fear is not based on reason, but on what they *imagine* us to be like.
Possible responses:
Camera lady: Turn toward her, smile, and say, "If you'd like a picture, just ask so I can smile."
Glaring men: Make eye contact, smile and nod or wave (not flamboyantly, but how a woman would wave).
Woman who said "...given 'em tits": "But God did give men tits. Men have nipples, they have mammary glands, they're just not active because of the testosterone."
And of course, there's always the stoic response of not saying or doing anything...like when a small dog is yapping, one ignores it lest the dog think he's more important than he really is.