hostile work environment suggests that 'inappropriate' material was present after requests were made to change it. No one hear has said that they would continue watching the listed shows if someone had an objection.
Having read the Bill of Rights, I can't remember any mention of a Right to never be offended.
R-Rated means inappropriate for audiences under 18. If individuals under 18 are sitting in the station 'late at night', there are larger issues to be dealt with, both from parenting and departmental perspectives.
It might be helpful approach grown up subjects with a grown up attitude. It sounds as if you might have approached someone watching the r-rated movies and not received the warm fuzzy response you anticipated. If this is true, perhaps presenting the argument the way you have here has something to do with it.
Of course I am just guessing, and if I have missed the mark I will apologize if I have hurt your feelings.