Why do people consider slut shaming and victim blaming to be the same thing?

I know this is a relatively sensitive issue, but it is always something that has confused me in certain feminist arguments.

I could probably write an entire essay, but to save myself a little time, I precisely share the views of the woman in this video.

I understand that people’s sexual promiscuity is none of my business and has nothing to do with me, but the same could be said for other things. A person’s hygiene has nothing to do with others either, yet if a person goes around being absolutely filthy, it is expected that people are going to make judgements about them. I feel like anyone has the right to do anything, but it should also make sense that anyone else has the right to have certain opinions. Obviously, certain behaviors and certain clothing choices will bring different types of opinions. Certain things have certain connotations.

Anyway, I’m not really eloquent lol. The girl in the video gives a better description of the point I’m trying to make. Is slut shaming necessarily a bad thing? Why do people feel so strongly about it?