Harassment is not when a guy makes a romantic advance. It’s when he hears a no and refuses to accept it.
There’s nothing evil, immoral, or wrong about approaching a person and expressing admiration and / or interest. What is immoral and wrong is insisting after a person makes it clear she is not interested.
It’s normal for people to want to meet other people, including for romantic purposes. It’s normal to find somebody attractive and want to express your admiration. What’s not normal is failing to understand and accept that the interest might not be mutual. It’s the ones who keep insisting, moaning, begging, and droning on like broken robots that I hate.