FLT CREW FAILS TO FOLLOW ATC INSTRUCTIONS.

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I WAS FLYING WITH MY CHIEF PLT WHO WAS THE PF. WE WERE CRUISING AT FL340 W OF THE SAT VOR. WE WERE DEVIATING W AROUND A BAND OF WX. THE WX BELOW US AND TO THE W WAS CLR DOWN TO ABOUT 15000 FT WHERE THERE WERE CUMULUS CLOUDS. WE WERE INSTRUCTED TO DSND TO FL290 BY CTR. AS I BEGAN TO READ BACK THE CLRNC I WAS OVERRIDDEN BY THE CAPT AS HE TOOL CTL OF THE RADIO. HE TOLD CTR THAT WE COULD NOT DSND. AFTER BEING QUESTIONED BY ATC HE TOLD THEM THAT WE COULD NOT DSND BECAUSE OF WX (WHICH WAS NOT TRUE). THEY RESPONDED BY TELLING US TO TURN R TO HDG AND GAVE US PLT'S DISCRETION TO FL290. HE THEN TOLD THEM THAT WE COULD NOT DO THAT EITHER. HE STATED THAT WE WOULD NOT TURN OR DSND BECAUSE OF WX. THE CTLR CORRECTLY QUESTIONED HIM ABOUT THE WX OUT TO THE W (WHICH THERE WAS NONE) AND THEN ASKED HIM IF HE WAS DECLARING AN EMER. HE STATED HE WAS NOT BUT TOLD THE CTLR THAT HE COULD IF HE WANTED TO. HE WAS ACTING DANGEROUSLY AND IRRESPONSIBLY FOR NO OTHER REASON THAN HE DID NOT WANT TO FOLLOW THE CTLR'S DIRECTIONS. HE STATED TO ME THAT HE HATED CTLRS TRYING TO FLY HIS AIRPLANE FROM THE GND. HE THEN WENT ON TO HAVE A VERY UNSTABILIZED DSCNT AFTER DISENGAGING THE AUTOPLT AT AROUND 12000 FT. HE PROCEEDED TO BUST A 2000 FT ALT ASSIGNMENT WHEN HE DSNDED TO 1600 FT WHILE TRYING TO JOIN THE LOC. THIS PLT HAS HAD PREVIOUS PROBS WITH ATC AND I BELIEVE ENFORCEMENT ACTION WAS STARTED A YR OR TWO AGO BUT WAS MYSTERIOUSLY DROPPED FOR SOME REASON. THIS WAS A SIMILAR SIT WHERE HE ENDED UP CANCELING IFR AND PROCEEDING VFR AFTER HE WAS ASKED TO SLOW DOWN AND HOLD FOR SEQUENCING. I HAVE NO DOUBT THAT IF I WOULD HAVE INTERVENED IN THE FLT MY JOB WOULD HAVE BEEN IN JEOPARDY. THIS PLT HAS NO REGARD FOR THE RESPONSIBILITIES OF ATC AND BELIEVES HE IS MORE IMPORTANT THAN ANYONE ELSE. I BELIEVE THAT BECAUSE OF HIS COMPLETE LACK OF SAFETY AWARENESS AND REFUSAL TO OBEY ATC HE IS A LIABILITY IN THE AIR AND DOES NOT DESERVE THE PRIVILEGE OF FLYING ACFT ANY LONGER.