To be sexual harassment, it has to be unwelcome, repeated behaviour that the victim has told the perpetrator is not welcome or is inappropriate, and has asked them to stop. If not it might be an attempted pass, pickup or proposition, but it isn’t sexual harassment, at least not yet.
I disagree with Tracy about the booze, too. Alcohol is a depressant, and the first thing it depresses is judgement, inhibitions and common sense. A drunk man is much more likely to misread body language, see invitations where there are none, and have lowered ethical expectations of himself, so I think drinking has a high probability of encouraging him to try out his “seductive moves” which to others will appear as a drunk hitting on a woman after too many drinks. The trick for the guy is to have drunk enough to have the confidence endowed by dutch courage but to have not drunk so much as to have impaired their social graces to any degree. It’s a fine line between confident extrovert and and pushy pest, and most guys have crossed that line at some time in their lives. Most women have ways of tactfully diverting this sort of attention, if it is unwelcome. Of course alcohol has similar effects on the female brain lowering their judgement, inhibitions and common sense, too.