because rape isn't a joke. it's really not that complicated.
you wanna joke around about cap's shield having the same properties as mjolnir to ruffle some feathers? whatever. you want to complain about a movie you haven't even seen yet? whatever.
but referring to a character getting "raped" is simply unnecessary and asinine. this isn't the first time you and i have butted heads on an issue like this, and i know you have the ability to recant idiotic statements, but i'm guessing that, in this instance, i'm just talking to a brick wall.
tl;dr rape jokes don't work and aren't funny for a whole multitude of reasons. find a new way to describe something without making at least 1/3 of people upset and angry, because it's a lot easier to be nice than to be a dick.