There's nothing wrong with dancing, liking to dance or even going to a club to dance. The sin is that the music is Lady Gaga at best and some flavor-of-the-week rapster wanna be at worse. Actually, it could get really ugly if the DJ played "Who Let the Dogs Out", but we won't count your cousin's wedding reception here.
Why do I not associate dance music with New Order or even, more recently, MGMT? Both groups make perfectly acceptable songs to listen to, and most of them have beats funky enough to get even the most rigid of us to swing a hip or two.
Even if dancing is the activity and listening to the music is secondary, I would still think it imperative to the conscientious listener not to pollute themselves with noise that amounts to the music equivalent of empty calories.
Lady and maybe a Gentleman: I give you Norway's Casiokids. From what I understand, their forthcoming album will be the first Norwegian language record released in the US. That's right, you won't be able to understand what they are singing. However, from what I've heard, it won't matter one bit.
This is music that dares you not to throw a party.