Rape has always been trivialized. I was raped a couple times, and both times people told me not to make such a big deal of it.
And people do indeed joke about just about everything under the sun. I get upset at offensive stuff from many sources, but I don't expect a lot of refinement on Facebook. Facebook is known to be a skeezy company. I deleted my account years ago, though. Maybe I'd be upset if I was still there.