PA46 PLT IS CHALLENGED BY ZLA OVER RTE OF FLT AND ASSIGNED ALTS.

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DEPARTED APA IFR (HARD); VECTORS FROM DEN TO DVC-J146. CONTINUED AT FL260 ON J146. PASSING PAGE SET; JUST ON J146 DIRECT NOOTN INTXN AND LAS VOR 116.9; HDG 234 DEGS; ABOUT 110 MI FROM LAS. ENRTE; CTLR ADVISED TO DSND TO FL240. THEN ADVISED TO FL200. BELOW DURING DSCNT; ADVISED TO CHANGE FREQ 'LA' ON REACHING FL200 (CONFUSION SETS IN). THIS CTLR ASKED ME AT WHAT ALT I WAS AT. I TOLD HIM 'I AM JUST REACHING FL200.' HE CHEWED ME OUT THAT I SHOULD HAVE BEEN AT FL210. I MAY HAVE MISUNDERSTOOD. MY MIND SET WAS FOR EVEN ALT. 'OK; IF YOU WANT; I'LL GO BACK TO FL210.' HE TOLD ME 'YOU ARE ALREADY AT FL200; CONTINUE DOWN TO 15000 FT.' THEN I GOT FURTHER CONFUSED. HE ASKED MY HDG. I GAVE IT TO HIM AND HE ASKED WHERE I WAS HDG. I TOLD HIM DIRECT LAS 116.9 DIRECT VGT NLV. HE CHEWED ME OUT ON MY IFR FLT PLAN J146 WHO GAVE ME THAT CLRNC. MY MIND SET I CAME ON (J146; THAT'S DIRECT LAS) I WAS AT FL260. ADVISED TO DSND TO FL240. THEN (200 I THOUGHT UNTIL HE CHEWED ME OUT) I WAS DSNDING DOWN FROM FL260 ON J146 AND THAT WAS DIRECT LAS. (HAD NOT HEARD ANY OTHER INSTRUCTION OTHER THAN DSND (FROM FL260 J146). TO ADD TO THE CONFUSION; THERE WERE ADVISORIES BEING GIVEN TO ANOTHER ACFT WITH A SIMILAR CALL NUMBER. AS I GOT CLOSER; I WAS TRYING TO GET ATIS AT VGT. I WAS TRYING TO UNDERSTAND WHAT THIS CTLR WAS TRYING TO GET ME TO DO. YES; I DID GET CONFUSED. HIS ATTITUDE WAS NOT VERY GOOD. HE WOULD GIVE INSTRUCTIONS. HE GAVE ME MEADS INTXN. I FIRST UNDERSTOOD DIRECT MEADS THEN AS I TRIED TO CLARIFY; HE WOULD GET UPSET AND CHANGE THE INSTRUCTIONS; THEN ENDED UP BY DUMPING ME TO ANOTHER FREQ. I THINK HE WAS TELLING ME TO INTERCEPT V8; THEN V562 DIRECT LAS DIRECT VGT. I THINK HE UPSET ME (CONFUSED). THEN HE GOT UPSET; BUT I BELIEVE HE CAME UP ON FREQ READY FOR COMBAT.