B767 CAPT LANDED SHORT OF THE RWY; IN THE OVERRUN AREA.

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ACR FLT XXX FROM SLC TO JFK. THIS WAS AN UNEVENTFUL FLT UNTIL THE LAST 500 FT AGL. WE WERE CLRED FOR THE VISUAL APCH TO RWY 31R IN DAY VMC. THE ACFT WAS CONFIGURED; ON THE GS; AND GIVEN A LNDG CLRNC. THE CAPT WAS FLYING THE ACFT. AT APPROX 300 FT AGL; THE CAPT POINTED THE NOSE OF THE ACFT AT APPROX THE MIDDLE OF THE DISPLACED THRESHOLD. THE ACFT WENT 1 1/2 DOTS BELOW THE GS WITH THE GPWS 'GS' WARNING ANNUNCIATING. I ASKED HIM WHAT WAS HE DOING? HE IGNORED MY STATEMENT AND CONTINUED. I CAN ONLY ASSUME THAT HE WAS ATTEMPTING TO LAND ON THE FIRST 100 FT OF THE RWY. UNFORTUNATELY; HE DID NOT FLARE THE ACFT LONG ENOUGH AND LANDED ON THE DISPLACED THRESHOLD APPROX 100 FT SHORT OF THE RWY. ON ROLLOUT; I TOLD HIM THAT IT IS NOT LEGAL TO LAND ON THE DISPLACED THRESHOLD AND ASKED HIM WHY HE DID IT. HE REPLIED ANGRILY THAT I DID NOT GIVE HIM RADAR ALTIMETER CALLOUTS BELOW 10 FT AND THAT I WAS TO BLAME. HUMAN FACTORS: IN MY OPINION; THE CAPT DID NOT USE CRM. HE DID NOT COMMUNICATE HIS NONSTANDARD INTENTIONS ON THE APCH. I ALSO BELIEVE HE USED POOR JUDGEMENT IN TRYING TO LAND ON THE FIRST SECTION OF THE RWY; ON A 10000 FT RWY. IN ADDITION; HE WOULD NOT SHOULDER THE BLAME THAT WAS CLRLY HIS; AND INSTEAD BECAME BELLIGERENT AND ANGRY. I DON'T KNOW IF I COULD HAVE DONE ANYTHING TO PREVENT THIS INCIDENT.