Why do men seem to think it's okay to approach women on the street?

I hate when men approach me on the street expecting a date or whatever. When I ignore them and reject them they get mad and call a *********" or a bougie.I think it's rude, improper, and low-cl.Most of the men who do it are bums, and they are ghetto and just dingy looking. I was raised not to speak to a strange man out in public unless we are at a social function such as school, a wedding, a dinner party, a debutante ball, a funeral, or a religious setting(church, synagogue, mosque,Etc.)Men, if you want instant gratification from a woman, go on Craigslist or Myspace.