n California, as in most states, sexual harassment is a violation of law. California law prohibits sexual harassment of all types in employment and requires employers to train supervisors on how to prevent and deal with sexual harassment.
Hitting on someone would not fall under the category of sexual harassment. Now if I went up to a woman and got pretty sexually suggestive with me, and she said something like, I dont appreciate that and I would like for you to leave me alone, and I persisted, I could likely be charged with something else.... Im not even sure what. In most public settings it would take the business to ask an offensive person to leave, and if they didnt comply they likely could be charged with trespass. which is a misdemeanor.
I looked up stalking and no way would that apply here. I doubt any legal claim could possibly be brought up even if Mike asked her for some sexual encounter.... again, inappropriate, but not illegal. Also, the reaction from the other party to said comments would clearly come into play as well.