I told the story to a couple of (young, female) coworkers, and they took much more exception to the response ("is that a prediction?") than to the initial statement. But they expressed concern at the whole exchange, and the general atmosphere (as reported by me) in that lab. This made me feel better: it's not just me being sensitive, and it's not just me thinking that I can't really call them on this incident.
The term "raped" is used in SoCal where I'm used to hearing "screwed" or "buggered", which, I suppose, technically have very similar meanings. I've heard people use it before, and always been very shocked, Mat even used it once when referring to to unpleasant financing terms on a car loan, but after seeing me turn green he never used it again.
I suppose the upshot of this little episode is that I have learned two things: I am hypersensitive due to my personal history, and it's worth it to tell a contemporary when I feel uncomfortable, chances are she'll agree with me, but reporting to supervisors doesn't always make a difference.