PA28 PLT TAXIING FOR TKOF IS FORCED TO BRAKE ABRUPTLY TO AVOID ACFT CLEARING THE RWY.

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AFTER OBTAINING MY IFR CLRNC FOR DEP; I WAS ADVISED BY GND CTL TO TAXI TO RWY 24 (REQUIRES A TAXI ON THE PARALLEL TXWY A). I NOTICED A CE402C LAND AND TURN OFF ONTO TXWY C (EXPECTING THE ACFT TO HOLD SHORT OF TXWY A; BUT TAKING NOTHING FOR GRANTED KEPT MY EYES OPEN). OF COURSE; THIS 'COWBOY' CUTS RIGHT IN FRONT OF ME CAUSING ME TO STEP ON THE BRAKES (BEING A NEW JERSEY DRIVER; I ALWAYS ANTICIPATE SOMEONE DOING SOMETHING STUPID AND UNEXPECTED; SO I DIDN'T HAVE TO LOCK UP MY BRAKES). AS THE CE402C PLT CUT ME OFF; HE WAS IN THE PROCESS OF CONTACTING GND; I KEYED MY MICROPHONE AND INDICATED THAT I WAS JUST CUT OFF. (I HAVE NO WAY OF KNOWING IF THE TWR CTLR TOLD THE PLT TO TAXI TO THE RAMP ON TWR FREQ OR THE PLT JUST ASSUMED HE WAS GOING TO GET PRIORITY TREATMENT TO THE RAMP.) HOWEVER; THE PLT APOLOGIZED TO THE GND CTLR -- NOT ME! IT NEVER SURPRISES ME WHEN I SEE THESE COWBOYS WORKING FOR ACR Y. JUST LISTENING TO THE UNPROFESSIONAL EXCHANGES WITH THE CTLRS; LISTENING TO OTHER ACR Y FLTS RPTING INBOUND VFR TODAY UNDER A 1300 FT OVCST (WHILE RPTING AT 1100 FT; SURE DOESN'T SOUND LIKE 500 FT BELOW A CEILING); WATCHING THEM TAXI AT 20+ KTS; IT'S AMAZING THAT THEY HAVE SUCH A GOOD SAFETY RECORD.