AN FAA SAFETY INSPECTOR TRAVELLING AS A PAX; INFORMS AN ACR FLC THAT THE ACFT WAS NOT CLR OF THE LNDG RWY WHEN ATC ALLOWED ANOTHER ACFT TO TAKE OFF.

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APCH AND LNDG UNEVENTFUL. TAXIED OFF AT SECOND HIGH SPD TXWY AND CONTACTED GND CTL. GND CTL SAID TO STOP; SO WE STOPPED ON THE HIGH SPD. GND THEN CLRED US TO TAXI TO THE GATE. WE DID SO. UPON PAX DEPLANING; 1 PAX INTRODUCED HIMSELF AS AN FAA SAFETY INSPECTOR AND THAT; AS A PAX SITTING IN COACH; HE NOTED THAT TWR HAD CLRED AN ACFT FOR TKOF 'WHILE OUR TAIL WAS HANGING OUT OVER THE RWY.' HE SAID TWR HAD ERRED IN CLRING SOMEONE FOR TKOF WHILE WE WERE NOT COMPLETELY CLR OF THE RWY (SINCE GND HAD TOLD US TO STOP). IT APPEARED TO ME THAT OUR TAIL WOULD HAVE BEEN CLR; AND I DON'T THINK THAT GND WOULD HAVE TOLD US TO STOP HAD OUR TAIL BEEN HANGING OVER THE ACTIVE RWY. THE FAA GUY SEEMED CONVINCED THAT OUR TAIL WAS 'HANGING OUT THERE' AND THAT TWR SHOULD NOT HAVE CLRED ANYONE FOR TKOF UNTIL WE HAD TIME (AND CLRNC FROM GND) TO CLR THE RWY. THE FAA GUY SAID HE WOULD 'TAKE CARE OF THE TWR GUYS;' AND THAT IT WAS THEIR MISTAKE. QUITE FRANKLY; I DON'T SEE HOW THE FAA GUY IN COACH COULD DETERMINE THE ACTUAL LOCATION OF OUR TAIL -- THE HIGH SPD TXWY IS LONG ENOUGH TO CLR THE RWY FOR OUR ACFT.