Truth be told in the "court of opinion" there has never been such a thing as "innocent until proven guilty".
If we really believed in innocent until proven guilty we would never publish the name of the person being (accused) of a crime. Even the "person of interest" label is enough to cause most people to lose jobs, friends, and family support.
As soon as someone is arrested people say:
"They caught that guy who ..etc"
I still recall Richard Jewell being accused of setting off a bomb at the Olympics in Atlanta. It pretty much ruined his life even though it was proven he was innocent.
We live in a society which lacks patience when it comes to the wheels of justice. We want "instant results" and we see trials as a mere formality.
The Duke lacrosse case was a 2006 criminal case in which three members of the Duke University men's lacrosse team were falsely accused of rape. Students had their names published and they were expelled from the university before there was a trial. Accusations get a ton of press but vindication gets very little press. We move on to the next BIG Thing.
When it comes to rape and sexual harassment there's also the added pressure to instantly believe the accuser before there's a trail because it validates and encourages more victims to come forward. Whenever there are tons of accusers it's a pretty difficult to believe they're all lying.
Last but not least there are $$$$ at stake. No company is willing to risk millions or billions of dollars supporting anyone accused of a major crime or immoral act. Supposedly Gal Gadot (Wonder Woman) told Warner Brothers she will not do the sequel if Brett Ratner's production company is a part of it. For Warner Brothers it's a no brainer to buy him out.
Clearly touching/grabbing/exposing oneself/ certain comments will rightfully be considered harassment unless the other person is "into that/them"
Over the next few years we as a society will be adjusting and defining sexual harassment. Right now using sexual innuendo or bad "pickup lines" can be seen as sexual harassment if the person is not interested in the one propositioning them.
However if that person (is interested in them) the same behavior isn't viewed negatively. It becomes one of those "in the eye of the beholder" type of things. Therein lies the difficulty.
It's subjective based upon (mutual interest) in each other.