PVT PLT OF AN SMS SEL FAILS TO STOP SHORT OF TXWY AS REQUESTED BY TWR AFTER TURNING OFF RWY AFTER LNDG. CAUSING CONFLICT WITH ANOTHER TAXIING ACFT.

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CLRED TO LAND AND LANDED--TWR REQUESTED 'L NEXT TXWY--GND POINT 6.' 2 ACFT LNDG BEHIND ME (DISTANCE UNKNOWN). UPON CLRING JUST PAST HOLD SHORT LINES AND ONTO TXWY AND SWITCHING TO GND FREQ I WAS VERBALLY REPRIMANDED FOR NOT HOLDING SHORT OF TXWY AS I CAUSED A CONFLICT WITH TAXIING TFC (A CESSNA 172?). MY PAX (A PLT) NOR I HEARD 'HOLD SHORT' (A TELEPHONE CONVERSATION WITH TWR GND CTLR INDICATED THAT HE HEARD THE TWR GIVE A HOLD SHORT INSTRUCTION). 2 THOUGHTS COME TO MIND. 1--I COULD HAVE SAID 'UNABLE' AT TWR REQUEST TO TURN OFF NEXT TXWY. I WAS STILL SMARTLY MOVING ALONG AND HVY BRAKING WAS REQUIRED. IF THEY WERE CONCERNED ABOUT A CONFLICT ON TXWY OR LETTING ME HANG OUT BTWN TXWY AND RWY; I COULD HAVE EASILY EXITED NEXT TXWY. IT WOULD BE NICE IF THEY WOULD HAVE SAID 'GND 21.6' VERSUS POINT 6. I FORGOT TO CHK MY ARPT FACILITY DIRECTION FOR GND FREQ AND THINKING ABOUT WHAT THIS FREQ WAS UPON TOUCHDOWN. MAY HAVE STOPPED MY EARS FROM WORKING FOR A FEW SECONDS. (TWR DID SAY OVER TELEPHONE 'NO PROB.')