The important things in this thread were the safety issue and the embarrassment issue.
In my work place they talked about the toilet seat in a staff meeting and did not mention names.
As for the nurse whispering in your ear, well I think most people assume that men are not modest and not easily embarrassed. In this case, you felt violated and I don't think that was what she intended.
When she used the word "follow..." well that was probably the wrong word to use and conveyed the wrong message. I don't think she was really "following" you.
I don't think you should report it because it might take away your credibility. Even if you do, a good DoN might get you both together in the office to help improve your communication.
I don't think she meant to be rude.
Safety is important here and it might need another thread.
One poster mentioned that someone had to be carried out by rescue when they did not see that the seat was down. For that one case, mentioned on public media, there are probably hundreds of others that the public has never heard about. I don't think someone really has to be helpless to hurt themselves when they do not notice that the lid was left up.