I am not sure they should have taken that approach, but I think they went with an interpretation and their dance was very good. May be they should not have done it- its interfering in other people's life.
But still its ironic that Karan Johar pointed it out, not that he was wrong either in doing so. He has the complete right to say that they were wrong, and he did not like the interpratation.
Life is Ironic I guess.