ACR TAXIES WRONG TAXIWAY MUST EXECUTE 180 TO GET BACK AND TAXI ON RWY.

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AFTER LNDG ON 21R; WE WERE CLRED BY METRO TWR (135.0) TO TURN L ONTO RWY 9 AND HOLD SHORT OF 'FOX'. THE CAPT BEGAN TO TURN ONTO VICTOR AND I REPEATED THAT TWR SAID TO TURN ONTO RWY 9 AND THE CAPT DID SO. HE WAS TAXIING VERY SLOWLY AND LOOKING L AND I REITERATED THAT WE WERE TO HOLD SHORT OF 'FOX' AHEAD. THEN I SAID THAT I WOULD CHK TO SEE HOW FAR AHEAD IT WAS. AS I LOOKED TO MY R AND DOWN TO WHERE MY ARPT DIAGRAM WAS THE CAPT SAID; 'I'M TURNING HERE.' I LOOKED UP AND HE HAD TURNED L ONTO 'WOLF.' THE CAPT TOLD ME TO TELL GND CTL (121.8) THAT WE WERE ON 'WOLF.' I DID AND GND TOLD US TO DO A HARD 180 DEG TAXI BACK ONTO RWY 9 AND HOLD SHORT OF 'FOX.' AS WE TURNED AROUND THE CAPT MUTTERED THAT HE HATED TAXIING ON RWYS. GND CAME ON AND TOLD US TO CONTACT GND ON 119.45. I UNDERSTAND THAT THIS CAPT MAY BE ADVERSE TO TAXI ON A RWY IN THE WAKE OF RECENT ACCIDENT WHERE ONE OF OUR FELLOW CAPTS DIED AS HE LANDED ON TOP OF A COMMUTER IN LAX; BUT AS A PROFESSIONAL; EMOTIONAL REACTIONS MUST BE TEMPERED BY ACTUAL SITUATIONS AND COMMON SENSE. IN THIS SITUATION THE ATIS DID RPT RWY 9 CLOSED. NUMEROUS SECTIONS OF TAXIWAY; ESPECIALLY NEAR 'WOLF' -- AT Y5 AND Y6 -- WERE CLOSED AND CONSTRUCTION WAS IN PROGRESS AT VARIOUS POINTS NEAR THERE; AND THERE WERE A NUMBER OF OTHER ACFT TAXIING IN THE VICINITY OF 'WOLF' AND 'FOX.' ASIDE FROM SLAMMING ON THE BRAKES AFTER THE TURN ONTO 'WOLF' HAD BEEN MADE (SINCE I HAD BEEN LOOKING DOWN AT THE ARPT PLAN VIEW WHEN THE TURN WAS MADE); I FEEL THERE WAS NOTHING ELSE I COULD HAVE DONE TO HAVE PREVENTED THE CAPT FROM HIS INAPPROPRIATE TURN. THOUGH I AGREE IT IS A CAPT'S DUTY AND RESPONSIBILITY TO CONDUCT A SAFE OP; AND CLRLY BY HIS COMMENT; HE FELT 'UNSAFE' TAXIING ON RWY 9; HIS DECISION WAS INAPPROPRIATE AND I DISAGREE WITH IT. I HOPE IN THE FUTURE THIS CAPT CTLS HIS 'REACTIONS' AND COMMUNICATES HIS CONCERNS TO HIS FO OR/AND TO ATC.