THE CABIN CREW OF A B727-200; ENRTE DFW TO MMUN; WERE CONFRONTED BY AN UNRULY PAX.

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DURING BOARDING; PAX SEATED IN XA OR XB GOT ON JOKING AND SAYING THEY DIDN'T KNOW EACH OTHER. WHILE PERFORMING THE MANUAL SAFETY DEMO; I HAD TO ASK FLT ATTENDANT #1 TO STOP THE SAFETY PA. I ASKED THE PAX TO PLEASE KEEP IT DOWN AS I COULD NOT EVEN HEAR THE SAFETY DEMO PA; AS THEY WERE VERY LOUD; DISRUPTIVE; AND CAUSING OTHER PAX TO LOOK AT THEM. I MENTIONED TO THE PURSERS I BELIEVED PAX APPEARED TO BE INTOXICATED. PURSER SAID NOT TO SERVE THEM ANY ALCOHOL. UPON INFORMING PAX OF THIS DECISION WHEN REQUESTING DRINKS; THE MAN IN XB BECAME IRATE; VERBALLY AGGRESSIVE; AND CHALLENGING. INFLT; HE CORNERED THE PURSER IN THE FIRST CLASS GALLEY AND WAS IRATE AND CONFRONTATIONAL. WHILE I SAW THIS; I CALLED THE CAPT AND TOLD HIM WHAT WAS GOING ON. HE SAID TO CALL IF WE NEEDED TO LAND. I PASSED THE INFO ON TO THE PURSER. HE KEPT HARASSING ME EACH TIME I WALKED PAST HIM TRYING TO SERVE THE FIRST CLASS MEAL. HE LATER APOLOGIZED. THE PURSER SHOULD HAVE CALLED COCKPIT TO LAND PLANE AFTER PAX CONFRONTED HIM IN FIRST CLASS GALLEY AND CONTINUED TO HARASS ME WHILE I WAS TRYING TO SERVE MEAL. CAPT SHOULD HAVE LANDED. OR; CAPT SHOULD HAVE HAD PAX MET BY AUTHS IN CANCUN FOR HIS AGGRESSIVE; DISRUPTIVE BEHAVIOR.