Questioning Hatikva

One of DovBear's readers asks::

On Purim night we had in our shteeble a band that played some good music. In between sets, the keyboard man started hammering out the Hatikva. One of the people at the party took the mike and began to sing. Would you believe that the Rav's son ran out so as not to hear the music, he said later? And the Rav himself claimed not to know that it was the Hatikva, but later when he found out he was really steamed. The Rav isn't a Naturai Karta person. He's just a plain old Chusid.

What are your thoughts on this matter?