Harassment is a rather strong word as it is intentionally based and carries language that is not nice. I do know of people who do this but some of them simply do not understand social etiquette. There is a lady who does this and she does not mean for it to be harassment at all. She simply does not understand social cues, acuity. Whatever you want to call it. I doubt the police should be called but it is ok to say "I am not comfortable with that" if they don't take your cue at stopping them. If they are a threat and they don't stop then yes it might be considered harassment. There is nothing wrong with stating your feelings about it to that person at that time. 1st physically stop it. If that doesn't work 2nd then tell her. If that doesn't work...it's your call.