Sexual assault or sexual harassment or bullying, they are always unprovoked, unsolicited, and yes, in all cases the victim is blamed and shamed on purpose. What good is the assault to the perpetrator if they do not make the victim feel degraded and responsible for the assault? In the case of sexual harassment, the victim must certainly be made to feel responsible for all of the extracurricular attention.
As for bullying, name it, bullies are everywhere and they are angry and they are going to take it out on you for things you say and do, acting like it's your fault for being who you are or for even breathing. That starts in childhood. I speak from personal experience on that one, as one who grew up trying to mind my own business, but that is all I will say about that. This isn't about me. It's about bullies in general.
I think bullying and sexual harassment can definitely cross lines, as in, "What are you gonna do about it?" or "You tell anyone, I can make trouble for you." I would say that happens in both situations.