When the world gets in my face, I say Have a Nice Day but is that enough?

I am so fortunate to be attending the Bon Jovi concert with Beth Greene, a teacher at school and one I do hope will become a dear friend.  I was listening to some music tonight with the kids while Chloe was practicing soccer and Noah;s favorite song in Bon Jove Have A Nice Day.  The premise of the song is when the world is mean and nasty how do you react.  The idea in the song is you say Have A Nice Day but is this really enough?  It struck me that sometimes it is simply not enough to say have a nice day. 
    Over the weekend, I had the misfortune of being on the receiving end of what I would call an undeserved tyrade.  I was truly trying to be kind and ignore the injustice that had been done to me in favor of being understanding and supportive of a dear friend who is going through serious difficulties right now.  It did not turn out well for me. Should I have adopted another attitude different from Have a Nice Day?  Certainly an apology is warrante d but is it ok to just say Have a Nice Day and forget about the injustice?  Am I really doing society any good by maintaining a positive attitude in the face of serious hurt and pain?
    I am most fortunate to have a student for most of the school day, homeroom, 1st period, 7th period and the dreaded second bus load who seriously tries my patience.  The negativity this student exhibits is toxic and she is most disrespectful to boot.  I attempted today, to talk with her about choices explaining that sometimes we have to choose between good choices and better choices.  I encouraged this student to stay in her classrooms today as much as possible, only going to the restroom when it is absolutely necessary rather than using her pass which allows students three visits per day.  The drama in middle school is like a powerful magnet to this particular child.  Some of it is the student's own doing but a lot is not.  The idea was to limit the possibilities of being exposed to it by staying put.  Well, the student proceeded to yell at me and adult and tell me that I was getting on her nerves anyway. 
    Long story short, I had reached by limit.  The reaction was the last straw.  No longer am I going to ignore the rolling of eyes and the hand in the face gesture or the rude and disrespectful comments.  Furthermore, I notified my principal and assistant principal of the same after rudely telling the student to get out of my room and take the nasty attitude with you.  So listening to the song tonight made me think that in this generation there is far too much entitlement.  Is this a result of us simply ignoring poor and unacceptable behaviors by saying have a nice day?  I have not come to a clear answer on that question yet so I ask you....when the world gets in your face do you say Have A Nice Day?  If so is that enough?  If not then, what do you say?