The simplest retort I've heard to "I have nothing to hide" is "then send me a nude photo of yourself." Theres nothing wrong with nude bodies, but it is definitely private. I.e. privacy has nothing to do with hiding wrong/illegal things.
(obligatory disclaimer: a little inaccuracy saves a lot of explanation, but I think this gets the gist across)
(obligatory disclaimer: a little inaccuracy saves a lot of explanation, but I think this gets the gist across)