it's awful to see.. just ugly -  i would bet it was students who don't really know or understand what they wrote. they may understand its a slam , probably couldn't explain what it means beyond the most basic .
 kids do dumb things sometimes. just to get a rise out of someone. they are probably reading this and loving every minute of it. both #BBL (sorry for abbrev.) and JimJ are right in that publicizing it insured there will be more. 
 LTD does do a good job of responding to this , but graffiti has been all over their stuff for years and this isn't worth the story.. it is newsworthy but ...don't make it so prominent. it is like wearing a post it that says kick me.