PA28 PLT ON HDOF TO PCT APCH CTL RECEIVES AN UNCLR INSTRUCTION FROM THE CTLR CONCERNING HIS DIRECTION OF FLT.

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THE CTLR SEEMED TO BELIEVE THAT I HAD IGNORED HIS INSTRUCTION TO PROCEED DIRECT TO GAI. THE ENRTE CTLR TOLD ME TO FLY A HDG OF 230 DEGS AFTER EMI; AND HANDED ME OFF TO THE APCH CTLR BEFORE EMI. THE 230 DEG HDG WAS A SET-UP FOR THE EXPECTED VOR RWY 14 APCH INTO GAI. SOON AFTER EMI; THE APCH CTLR ASKED ME TO STATE MY HDG AND IF I WAS GOING DIRECT GAI. I STATED THAT I WAS PROCEEDING ON THE 230 DEG HDG AS ASSIGNED BY THE PREVIOUS CTLR BUT THAT I COULD GO DIRECT TO GAI IF HE WANTED ME TO. THE WX CONDITIONS DID NOT SEEM TO REQUIRE A FULL INST APCH. I HEARD NO RESPONSE FROM THE CTLR AND CONTINUED ON MY ASSIGNED COURSE. SOON AFTERWARDS ANOTHER AIRPLANE IN TRAIL OVER EMI AND APPARENTLY HOLDING THE SAME 'FLY 230 DEG HDG' INSTRUCTION CAME ON FREQ AND ASKED IF HE SHOULD GO DIRECT TO GAI. CTLR TOLD HIM TO STAND BY. CTLR THEN ASKED WHAT HDG I WAS ON AND WHETHER I WAS GOING DIRECT TO GAI. I REPEATED THAT I WAS ON 230 DEG HDG AS ASSIGNED. HE REPLIED SOMETHING LIKE 'WHY AREN'T YOU GOING DIRECT LIKE I TOLD YOU 10 MI AGO?' I REPLIED THAT I WOULD NOW GO DIRECT AND CLARIFIED THAT HE HAD NOT IN FACT ISSUED THAT INSTRUCTION. I WAS THEN TREATED TO A LECTURE ON HOW IT WAS NOT IMPORTANT HOW WE GOT TO THIS SIT; ONLY THAT I SHOULD NOW GO DIRECT. THE BASIC OPERATIONAL PROB SEEMED TO BE THAT THE ENRTE CTLR WAS SETTING UP INBOUND AIRPLANES FOR A VOR APCH THAT THE APCH CTLR WAS NOT IN FACT USING. EVERYONE MAKES MISTAKES AND THE CTLR'S VOCABULARY CONTAINS PHRASEOLOGY DESIGNED TO SOLVE PROBS QUICKLY AND DISPASSIONATELY. IN THIS CASE IT SEEMED TO ME THAT THE CTLR PASSED JUDGEMENT REAL TIME OVER THE AIR WAVES SEEKING TO XFER BLAME TO THE PLT. NEXT TIME I'LL PRESS FOR A RESPONSE IF THERE'S ANY CHANCE OF AMBIGUITY.