A B737-800 PRIOR TO DEP THE #1 CAB ATTENDANT WAS REMOVED FROM THE FLT BY THE CAPT FOR INSUBORDINATION.

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PRIOR TO BOARDING MY FLT I MET A COMPANY PLT REQUESTING A RIDE TO ORD. SINCE OUR POLICY IS TO ALLOW JUMPSEAT RIDER TO TAKE A SEAT IN THE CABIN I ADVISED FLT ATTENDANT #1 OF THE PLT AND THAT I WANTED HIM TO SIT IN FIRST CLASS. SHE DID NOT RESPOND. LATER WHEN THE PLT CAME TO THE COCKPIT DURING BOARDING I ASKED HIM TO WAIT IN THE COCKPIT UNTIL WE WERE SURE THERE WAS ROOM IN FIRST CLASS THEN TO HAVE A SEAT THERE. FLT ATTENDANT WAS STANDING RIGHT NEXT TO HIM AND SAID NO. I ASKED WHAT HER REASON WAS; PERHAPS THERE WAS NO ROOM IN THE FIRST CLASS CAB. SHE SAID REGARDLESS OF ROOM HE WOULD NOT BE SITTING THERE PERIOD. I EXPLAINED MY REASONS FOR HIM SITTING THERE; IT'S A PROFESSIONAL COURTESY AND I THOUGHT IT A GOOD IDEA TO HAVE A CREWMEMBER SITTING NEAR THE COCKPIT IN THE EVENT OF A DISTURBANCE. SHE STILL REFUSED AND SAID WHY SHOULD I HAVE TO SERVE HIM. I SAID IN EFFECT BECAUSE I SAID SO. SHE SAID SHE WOULD FIND A HIGHER AUTHORITY AS SHE LEFT THE ACFT LEAVING LESS THAN FAA MIN CREW ON BOARD. I TOOK A DEEP BREATH AND DECIDED TO FIND FLT ATTENDANT AND DISCUSS THIS WITH HER TO DETERMINE WHETHER OR NOT SHE WOULD BE CONTINUING TO ORD WITH US. I FOUND HER ON THE JET BRIDGE WITH AN AGENT AND FLT ATTENDANT #4. I ASKED AGENT IF ANY SEATS WERE OPEN IN FIRST CLASS AND HE SAID YES. FLT ATTENDANT AGAIN SAID THE PLT WAS NOT SITTING IN FIRST CLASS. HER DEMEANOR WAS SHARP; DISRESPECTFUL; UNCOOPERATIVE AND ANGRY AS SHE WALKED AWAY FROM ME. THAT WAS WHEN I DECIDED SHE WOULD BE REMOVED FROM MY FLT. I TOLD HER TO GATHER HER BELONGINGS AND SHE DID. I CALLED DISPATCH AND TRIED TO EXPLAIN AS FLT ATTENDANT SHOUTED OVER ME THAT EITHER SHE OR I WOULD STAY IN ZZZ. OF COURSE DISPATCH AND I AGREED WE GO WITH MIN FLT CREW TO ORD WITHOUT FLT ATTENDANT. I BRIEFED THE REMAINING CREW OF THE SIT; SEATED THE PLT IN FIRST CLASS AND APOLOGIZED TO THE UNSUSPECTING PAX FOR BEING LATE AND WE WERE OFF TO ORD WITHOUT FURTHER INCIDENT.