I guess I'd ask, did your training use the word "embarrassment", because in common usage, it's simply not as strong of a word as "shame" or "guilt", which I believe is the point Umbran is trying to make. Even if a victim says they're just embarrassed, it's generally a stronger emotion than that.
Having been there for a couple of friends in college that went through similar situations, "embarrassment" seems to be a way to minimize the deeper feelings an assault creates, either as a coping mechanism for the stronger emotions, to avoid discussing them, or to try sparing the feelings of those who know about the situation, or a mix.