AN IRATE PLT TAXIING A C402B STRUCK A PIPER PA31 INCURRING DAMAGE TO THE PIPER PA31 WINGTIP.

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REPOSITIONED MY AIRPLANE TO RECEIVE GAS FOR MY NEXT TRIP. THE FAA REPRESENTATIVES STARTED TO ASK ME QUESTIONS WITHOUT PROPERLY IDENTING THEMSELVES. AND WHILE I WAS TAKING CARE OF MY AIRPLANE PREFLT FOR THE NEXT FLT HE CONTINUED TO ASK QUESTIONS. I STARTED TO GET UPSET WITH THIS INSPECTOR'S RUDENESS. WHEN I WENT TO RETURN MY AIRPLANE TO MY PARKING SPOT DOWN THE TARMAC A FEW HUNDRED FT; THE SPACING WAS VERY TIGHT. DISTRACTED BY MY THOUGHT ABOUT HOW UPSET THE FAA INSPECTOR SEEMED TO BE; AT ME; I PUT MYSELF IN A SIT THAT WAS NOT GOOD. I HAD TAXIED OR CREPT UP TOO CLOSE TO OUR OTHER AIRPLANE; A PIPER NAVAJO. I REACHED FOR THE IDLE CUT-OFF TO SHUT THE ENGS DOWN. I WAS ALSO WATCHING THE R WINGTIP AND INCHED TOO CLOSE TO THE OTHER AIRPLANE. I HIT THE BRAKE PEDAL AND THE AIRPLANE BOUNCED FORWARD AND BUMPED THE OTHER AIRPLANE. NO DAMAGE TO MY AIRPLANE BUT THE OTHER WINGTIP RECEIVED A SLIGHT DENT. THE FAA INSPECTOR THEN PROCEEDED TO MAKE A RPT. OUR ORGANIZATION MECH INSPECTED MY AIRPLANE AND SIGNED IT OFF TO FLY. THE OTHER AIRPLANE; THE INSPECTORS WANTED IT CHKED BEFORE RETURNING TO SVC. THIS PROB AROSE BECAUSE MANY DISTR AND EGOS.