FLC OF A JETSTREAM 32 FAILED TO TURN AT THE INTXN INTENDED BY ATC CLRNC ON A STAR ARR DUE TO THE FAILURE OF ATC TO CORRECT THE FLC'S READBACK; AND THE FLC'S FAILURE TO QUESTION THE CLRNC GIVEN BY ATC.

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I WAS FLYING INBOUND TO FTZ VOR ON TRAKE 7 ARR INTO STL. STL WAS USING RWYS 12L&R. CTLR TOLD US TO TURN L TO HDG 020 DEGS AT SNYDR INTXN (21 DME ON FTZ 082 DEG RADIAL). FO AND I THOUGHT THAT ODD SINCE THAT WAS RATHER CLOSE IN TO TURN US FOR VECTORS FOR ILS RWY 12R AT STL; BUT WE DID NOT QUERY HIM. WE WENT PAST COORS INTXN AT 10 DME ON FTZ 082 DEG RADIAL AND SOMEWHERE BTWN 15-20 DME ON FTZ 082 DEG RADIAL THE CTLR CAUSTICALLY REMARKED 'YOU MISSED YOUR TURN.' I TOLD THE CTLR HE SAID TURN TO HDG 020 DEGS AT SNYDR INTXN. (I MIGHT ADD AS TYPICAL WITH STL CTLR HE DID NOT ACKNOWLEDGE MY FO'S XMISSION OR CORRECT MY FO'S SUPPOSED ERROR WHEN MY FO FIRST READ BACK THE CTLR'S ORIGINAL INSTRUCTIONS.) HE THEN SAID TURN L TO HDG 350 DEGS AND LEFT IT AT THAT. FACTORS AFFECTING INCIDENT: 1) CTLR NOT LISTENING TO OUR READBACK TO CATCH HIS ORIGINAL ERROR. 2) FO AND MYSELF NOT QUERYING CTLR ABOUT 'ODD' INSTRUCTIONS. HOW TO PREVENT INCIDENT: 1) CTLRS MUST LISTEN TO PLT READBACKS. 2) PLTS SHOULD QUESTION CTLR ABOUT INSTRUCTIONS THAT MAY BE IN ERROR.