I'm not sure why anyone would be doing their highlights or posting on RV.net while on a camping trip. As someone said, if you are not behind the shower curtain/door then cover up!
There is this rather large gent at my gym that likes to hang out in the nude while in the locker room - even sits on the wood bench while naked. I casually mentioned once that I sit there sometimes, please at least use a towel. No problems since. Some times all it takes is a gentle nudge, or just plainly state your point of view. Calling the cops/911 is idiotic in this case.