Who's being slandered, exactly? They did tell the sexist jokes, right?
Because Adria didn't call them sexist, certainly not in the twitter or blog posts I've read. She just said it made her uncomfortable.
She accused them of being sexist, referring to the action as harassment and calling the individuals involved "assclowns".
I don't really see how the joke is sexist either, but that's not really the issue here.