AN ACR FLC FAILED TO MAINTAIN A CONTINUOUS WATCH ON FREQ WHILE ON FINAL APCH AT A CLASS B PRIMARY ARPT.

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I AM WRITING BECAUSE OF A HOT-TEMPERED CAPT. HERE IS THE SIT: I AM PF. WE ARE ON FINAL APCH AT 500 FT; AND HAVE ALREADY BEEN CLRED TO LAND BY TWR FREQ A. BTWN XMISSIONS; TWR FREQ A HAD A LOT OF STATIC ON IT. SO; AT 500 FT ON FINAL; THE CAPT SAID 'WHAT'S THE OTHER TWR FREQ?' WITHOUT ALSO SAYING HIS CALL SIGN. HE THEN SWITCHED TWR FREQS AT 500 FT AND STARTED TALKING TO TWR FREQ B; WHO HAD NO IDEA WHAT WAS GOING ON. THE STATIC WAS BOTHERSOME; BUT IT DID NOT IMPEDE CONVERSATION; AND THE CAPT'S FAILURE TO IDENT HIMSELF WHEN REQUESTING TWR FREQ B WAS INEXCUSABLE. THE CAPT DIDN'T TELL FREQ A WE WERE LEAVING THE FREQ. I (WHILE FLYING) DIALED IN FREQ A ON RADIO #3 AND VERIFIED OUR CLRNC TO LAND. AFTER LNDG; FREQ A (RADIO #3) TOLD ME TO CONTACT GND; AND THE CAPT WAS STILL ARGUING WITH TWR FREQ B WHEN I TURNED OFF THE RWY. I TOLD HIM WE WERE SWITCHED TO GND BY TWR FREQ A AND THEN HE SWITCHED OVER TO GND ON RADIO #1. I FEEL I DID THE BEST THING POSSIBLE; SINCE WE WERE ONLY 500 FT AGL WHEN THE CAPT LOST HIS TEMPER.