I think its fine to have difficult subject matter in a pop record, I mean look at 13 you didnt appreciate its significance, but then who would have expected you to?
Look at Black Flag's White Minority, it has been hugely mis-understood as some kind of racist record, but its being sarcastic. Perhaps some kids didnt get it, but they probably do now.
As for rude lyrics, check out my day 5 pick, which I felt was worthy of a NSFW tag , haha.