C208 PLT INITIATED HEADING CHANGE DUE TO WX FROM ASSUMED DEV CLRNC OF MIA DEP CTLR ONLY TO BE THE RECIPIENT OF A CTLR LECTURE; FURTHER COMPLICATED BY FLYING INTO CUMULUS CLOUDS.

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AFTER RECEIVING GND CLRNC FROM FPR; THE INSTRUCTIONS WERE AFTER TKOF; FOLLOW RWY HEADING UNTIL 2000 FT; AND THEN TURN TO INTXN BAIRN; THEN TO OCALA THEN TO GNV; WHICH WOULD HAVE REQUIRED A HEADING OF 290 DEGS OR 300 DEGS; FOLLOWING THE GPS. AFTER REACHING 4000 FT; TOLD THE MIA CTLR THAT THERE ARE SOME HVY BUILDUPS AND ASKED FOR COURSE CORRECTION OF AT LEAST 15-20 DEGS; BECAUSE I WAS HEADING FOR A LARGE TWRING CUMULUS. IT APPEARED AT THAT TIME THE MIA CTLR WAS ANGRILY ARGUING WITH SEVERAL OTHER ACFT IN THE GENERAL AREA. I WAS UNDER THE IMPRESSION THAT I WAS GIVEN FURTHER INSTRUCTION TO DEVIATE BECAUSE OF THE CUMULONIMBUS CLOUD; BUT AFTER A SHORT TIME; THE CTLR ASKED ME WHAT HEADING AND I TOLD HIM; SO HE STARTED ON ME THIS TIME; TELLING ME THAT I SHOULD FIRST CHK IN WITH HIM. I HAD CALLED HIM 3 TIMES VIA 132.25 AND ASSUMED THAT HE HAD HEARD ME. AFTER THE CTLR CORRECTED AND ADVISED ME; IN A VERY BELLIGERENT AND DEMEANING WAY; THAT I CHK IN BEFORE I TURN AGAIN; HE CLRED ON MY HEADING. AS I ENTERED THE CUMULONIMBUS CLOUD; THE AIRPLANE ENTERED SEVERE TURB; WHICH COMPLETELY KNOCKED OUT ALL OF MY INSTRUMENTATION AND ELECTRONICS; LOSING ALL OF MY NAVIGATIONAL EQUIP AND INST FLT INSTS. I WAS STILL ON COURSE; WHEN THE MIA CTLR STARTED ON ME AGAIN. I TRIED TO RE-EXPLAIN TO HIM; THAT I WAS STILL ON COURSE TO THE BAIRN INTXN. THIS TIME; THIS CTLR WAS TOTALLY OUT OF LINE; SEEMING TO ARGUE WITH EVERY ACFT UNDER HIS CTL IN THAT AREA. I ALSO HEARD THIS CTLR GIVE AN ALT CLRNC TO ANOTHER ACFT AND THEN TOLD THIS PLT THAT HE HADN'T GIVEN HIM. I KNOW EVERYONE HAS A CERTAIN AMOUNT OF BAD DAYS; BUT THIS CTLR HAD REALLY LOST IT THAT DAY. I FEEL THAT THE CTLR WAS GETTING EVERYONE MIXED UP WITH OTHER ACFT FLYING IN THAT AREA. I FIND IT TO BE A LACK OF COM BTWN THE KNOWN ACFT IN THE LCL AREA. I FIND IT VERY DANGEROUS THAT AN MIA CTLR WAS TOTALLY OUT OF CTL. HE SIMPLY COULD HAVE BEEN MORE HELPFUL THAT GIVEN DAY.