AN ACR FLC FLYING B727 AT MIA RPTS UNPROFESSIONAL CONDUCT OF WING WALKER WHILE TAXIING TO GATE.

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ATC FACILITY: MIA GND. ON TURN IN TO GATE RUN-IN LINE; BOTH WING WALKERS WERE NOT IN POS TO OBSERVE THE WINGS; STOPPED ACFT TO AWAIT THEIR ATTN. AFTER SEVERAL MINS; ONE WING WALKER ON THE L SIDE OF THE ACFT GOT IN POS TO OBSERVE THE ACFT AND TFC -- THE OTHER DID NOT. A RAMP PERSON DROVE OUT AND PLUGGED INTO THE ACFT WITH A HEADSET AND ASKED WHAT WE NEEDED. THE CAPT STATED THAT WE NEEDED THE WING WALKERS TO OBSERVE THE WINGS. HE LEFT AND RELAYED THE MESSAGE. THE R WING WALKER CONTINUED TO NOT OBSERVE. INSTEAD; HE FACED THE TERMINAL AND JUGGLED HIS BATONS. MEANWHILE; GND CTL WANTED TO KNOW WHAT THE PROB WAS AS TFC BEGAN TO BACK UP ON THE INNER TXWY; WHICH WE WERE BLOCKING. THERE WERE MANY VEHICLES IMMEDIATELY TO OUR L AND R. ANOTHER RAMP PERSON DROVE OUT ON A TUG; THE CAPT REPEATED THE NEED FOR THE WING WALKERS TO OBSERVE THE TFC AND ACFT BEFORE WE COULD MOVE. HE THEN RELAYED THE MESSAGE TO THE PARKING CREW; AND FINALLY THE R WING WALKER FACED THE ACFT AND TFC. WE PROCEEDED AND PARKED. AS WE TAXIED CLOSER; THE R WING WALKER WAS LAUGHING AND AT LEAST TWICE TURNED HIS BACK ON THE ACFT. EACH TIME WE HAD TO STOP UNTIL HE DECIDED TO OBSERVE THE ACFT AND TFC. BY THE WAY; EARLIER HE WAS ALSO SITTING ON THE WANDS WITH HIS BACK TO THE ACFT.