I think the message of the song is that guys standing up with only a guitar and their talent are a dying breed.
The trend is more hip hop, rap and lots of other crap that i too cant stand.
I certainly dont think the lyrics are offensive, people are getting too politicaly correct these days, whats wrong with stating your own opinion?
As for naming j lo in the song, i dont mind some of her stuff, wouldnt buy it, but if jon wants to sing that, big deal, its, his opinion and it doesnt bother me.{ also maybe he couldnt think of another word after hiphop that fitted as well}