BE1900 CREW WAS GIVEN A HEADING BY THE CTLR HE DID NOT INTEND TO GIVE IN A90 CLASS B.

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WE WERE INBOUND TO BOSTON ON GARDNER 2 ARR; ABOUT 15 MI FROM BOS; WHEN WE FIRST WERE GIVEN A VECTOR OF 090 DEGS. MINS LATER; WE WERE GIVEN 210 DEGS. ALTHOUGH WE THOUGHT IT ODD; I READ BACK THE 210 DEG HDG AND THE PF TURNED. APPROX 3 MINS LATER; THE CTLR CAME BACK IRRITATED ASKING US IF WE WERE ON A 120 DEG HDG. WE TURNED TO THE 120 DEG HDG AND EXPLAINED WE WERE GIVEN 210 DEGS. ALTHOUGH HE WAS IRRITATED; HE LATER CAME BACK AND SAID IT MAY HAVE BEEN HIS FAULT AND THAT 'NO HARM DONE.' LOOKING BACK; IT WOULD SEEM OBVIOUS TO SOMEONE THAT THE 210 DEGS SHOULD HAVE BEEN QUESTIONED WHEN IT WAS GIVEN TO US. BUT WHEN BOS IS METERING; IT IS NOT UNCOMMON TO GET HUGE DELAYING VECTORS ACCOMPANIED BY SPD RESTRS. WE HAD ALREADY BEEN GIVEN THE SPD RESTRS. JUST 2 DAYS PRIOR TO THIS EVENT; WE WERE GIVEN VECTORS; THAT IN ESSENCE S-TURNED US DURING THE ARR TO CREATE MORE SPACE. BUT; THIS HAVING HAPPENED; WE MUST NOT JUST READ BACK AT TIMES; BUT GET FURTHER VERIFICATION ON ODD HEADINGS IN A BUSY ENRTE ENVIRONMENT.