Public means public which means privacy is nonexistent.

Wherever we go there are surveillance cameras recording our every move and it's so accepted that it's expected. Yet many people believe permission should be requested by a photographer capturing images of you in the street.
Some people are so accepting, or realize they have no control, are not bothered by the camera and enjoy the chance to be noticed
I'm finding there's a thin line, between love and hate, when it comes to street photography. Some subjects love it, while others would prefer their privacy. I quess it's all in how you look at it. Please remember, whatever your feelings about public privacy, when you're in the public, you're susceptible to be photographed. !