A B737 CREW CLRING RWY AT DTW MADE THE WRONG TURN AND TAXIED ACROSS AN ACTIVE RWY.

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GND CTL GAVE US CLRNC TO THE GATE ON SPECIFIC TXWYS (V; H; TO THE GATE). AFTER LNDG ON RWY 3L; THE CAPT TURNED THE WRONG WAY AND I QUESTIONED HIM 'WHERE ARE YOU GOING?' AND TOLD HIM TWICE TO STOP. HE DID NOT RESPOND; AND STARTED TO CROSS RWY 9L WITHOUT A CLRNC. I WAS ABOUT TO STOP THE ACFT MYSELF; BUT AFTER MAKING SURE THE AREA WAS CLR; NO ACFT LNDG ON RWY 9L; RWY 27R PLUS ATC HAD OTHER ACFT XING RWY 9L AT OTHER TXWYS; I DID NOT APPLY BRAKES. PLUS I WOULD HAVE HAD TO JAM ON THE BRAKES AND IF ANY CREW MEMBERS OR PAX WERE OUT OF THEIR SEATS; THEY MAY HAVE BEEN INJURED. ATC TOLD US TO STOP AND ONCE AGAIN I TOLD HIM TO STOP. ATC GAVE US CLRNC BACK TO THE GATE. LATE; AT THE GATE; I TRIED TO TALK TO THE CAPT ABOUT THE INCIDENT; BUT HE WOULD NOT TALK ABOUT IT. BASED ON THE ABOVE EVENT AND OTHER SITS THAT OCCURRED THAT DAY; HE IS THE TYPE OF CAPT THAT NO FO IS TO QUESTION HIS ACTIONS. TALKING TO OTHER PLTS THAT HAVE FLOWN WITH HIM; THIS IS A COMMON OCCURRENCE. NOBODY IS TO QUESTION A CAPT; AT ANY COST. THIS APPEARS HOW THIS CAPT TIRES TO OPERATE HIS COCKPIT. EVEN WHEN I TOLD HIM HE WAS XING A RWY WITHOUT A CLRNC; HE IGNORED ME.