i have noticed this aswell
im 20, dont look like a gangster or anything by any means; if im walking down the street and there happens to be a mother and a child walking towards me, the mother will most often pull there kid to the other side of them.
i mean its not like im going to take your kid you can calm down, im just walking honest.
compleatly unrelated to the kid thing, i was in walmart the other day and i was looking around for hair removal stuff, and i ended up in the "female only section" with all the makeup and whatnot, the sales peroson there basicly got mad at me for being in there because i wasent "the type of person that should be in that section" being a guy sucks sometimes :S