B757 CREW WAS NOT GIVEN A PROPER GND CREW RELEASE TO TAXI.

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NO DEP SALUTE AFTER PUSH OUT. AT THE COMPLETION OF A NORMAL PUSHBACK FROM GATE IN MIA; WE WERE NOT GIVEN A DEP SALUTE BY THE PUSH CREW. WE HAD BEEN GIVEN CLRNC TO START ENGS DURING THE PUSH OUT. AT THE COMPLETION OF THE L ENG START; THE GND CREW ADVISED; 'PARK THE BRAKES.' MY EXACT WORDS TO HIM WERE 'PARKING BRAKES PARKED. YOU ARE CLRED TO DISCONNECT. I'LL SEE YOU OUT FRONT.' AFTER THE R ENG HAD BEEN STARTED AND WE WERE READY FOR DEP; I LOOKED OUT TO SEE THE 3 MAN PUSH CREW DRIVING AWAY IN THE TUG; RETURNING TO THE GATE. AT NO TIME DID I FLASH THE NOSE LIGHT NOR DID I RECEIVE A PROPER DEP SALUTE OR ACKNOWLEDGE IT TO THE GND CREW. WE CALLED RAMP AND ASKED TO HAVE THE CREW RETURN SO THAT I COULD SEE THE STEERING BYPASS PIN AND RECEIVE A DEP SALUTE; AND THAT WE WOULD BE UNABLE TO MOVE THE ACFT UNTIL THIS WAS ACCOMPLISHED. AFTER A 10 MIN DELAY; A TRUCK APCHED THE L SIDE OF THE AIRPLANE AND A GND MAN STEPPED OUT AND IN AN OBVIOUS AGITATED MANNER THREW HIS HANDS UP IN THE AIR ASKING 'WHAT.' HE STILL DID NOT SHOW ME THE PIN; BUT HE APPEARED TO HAVE THE PIN IN HIS L HAND WHICH WAS OBSCURED BY THE TRUCK DOOR. I FLASHED THE NOSE LIGHT SEVERAL TIMES TO INDICATE OUR READINESS; BUT STILL COULD NOT GET THE CORRECT RESPONSE FROM THE GND MAN. AS I OPENED MY WINDOW TO TRY TO COMMUNICATE WITH HIM; HE GAVE ME THE UNIVERSAL 'UP YOURS' SIGNAL; GOT BACK IN THE TRUCK AND DROVE AWAY. HIS POS ON THE RAMP WAS QUITE VISIBLE TO PAX ON THE L SIDE OF OUR ACFT. IN ADDITION TO A FAILURE TO FOLLOW SIMPLE; WELL ESTABLISHED RAMP SAFETY PROCS; HIS SUBSEQUENT ACTIONS; IN CLR VIEW OF PAX WERE TOTALLY UNPROFESSIONAL AND UNCALLED FOR.