While this is certainly a valid subject for debate, I'm thinking of the "just a song" that led to this thread (see Let's update 'Sensitive New Age Guys' if you're curious), and I think it makes sense to distinguish between a song with a serious/semi-serious intent and a light-hearted confection of a song whose main (sole, even?) purpose is to make people laugh -- in which case I think saying "it's just a song" is fair enough -- although perhaps it would be more appropriate to say "it's just a funny song".

Although if you don't think the song is actually funny, and/or you consider it to be unkind/small-minded/insensitive/politically incorrect/unfair to some people, then I guess we're back to square one...

Cheers,

YY