AIRBORNE CARJ FLC CHALLENGED BY PTK TWR ABOUT COMMON FREQ USAGE WHEN FLC COORDS WITH BUF TWR FOR RWY USAGE AS DIRECTED BY BUF APCH CTL.

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ENRTE FROM CVG TO BUF; AS PER NOTAM; I CONTACTED BUF APCH ON FREQ 126.5 20 MINS PRIOR TO ARR TO COORDINATE USE OF RWY 5/23. BUF APCH ADVISED ME TO CONTACT BUF TWR ON FREQ 120.5. AFTER MY INITIAL CALL; BUF TWR'S RESPONSE WAS BLOCKED; BUT ON SECOND ATTEMPT; COM WAS ESTABLISHED. I EXPLAINED THAT WE WERE 20 MINS OUT; AND WISHED TO COORDINATE FOR LNDG ON RWY 5/23. HIS REPLY WAS THEN BLOCKED REPEATEDLY; AND I ASKED HIM TO REPEAT SEVERAL TIMES. I THEN HEARD PONTIAC TWR XMITTING THAT I WAS ON HIS FREQ AND MUST CEASE XMISSION. I ATTEMPTED TO EXPLAIN; REASONABLY; THAT I WAS ALREADY IN CONTACT WITH BUF TWR PER BUF APCH INSTRUCTIONS. AT THAT TIME; THE PTK CTLR BECAME BELLIGERENT AND THREATENING; STATING THAT HE HAD MY CALL SIGN; AND THIS WAS MY LAST WARNING. I APOLOGIZED TO HIM; AND RETURNED TO BUF APCH; ASKING FOR COORD BY LANDLINE. THROUGHOUT THE XMISSION; I HEARD NO OTHER ACFT. BUF APCH STATED THAT BUF TWR ROUTINELY HEARS ACFT CALLING PONTIAC TWR. CAUSES: 1) APCH'S RECOMMENDATION FOR ACFT TO CALL TWR WHEN TOO HIGH (ACFT IN FLT LEVELS). 2) TWRS TOO CLOSE TOGETHER ON SHARED FREQ. COMMENT: THIS COM NEEDED ONLY 1 CALL AND A REPLY. BY BEING RUDE AND ANGRY; THIS CTLR INCREASED THE DURATION OF CONGESTION AND NEARLY PROVOKED A VERBAL BATTLE. FREQ CONGESTION REQUIRES INCREASED TACT AND PROFESSIONALISM; NOT AUTHORITARIAN THREATS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR ADVISED THAT SUBSEQUENT TRIPS INTO BUF TILL MONTH'S END CAUSED NO FURTHER DIFFICULTIES. TRACON EFFECTED TWR COORD FOR RWY USAGE.