SMA PLT ON FLT FOLLOWING GIVEN CLRNC TO DSND AND MANEUVER FOR WX AVOIDANCE IS GIVEN A HDOF TO NEXT CTLR WHO IS VERY UPSET THAT HE HAS NOT MAINTAINED ASSIGNED HDG AND ALT.

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I WAS VFR AT 10500 FT FROM JAN TO PFN DIRECT. THERE WAS A LINE OF TSTMS 20 MI WIDE FROM MOBILE TO CRESTVIEW VOR. THERE WAS A 10 MI WIDE VFR RTE (BREAK IN TSTM LINE) FROM BREWTON TO PENSACOLA. I CONTACTED FLT WATCH AND DISCUSSED MY OPTIONS; ENTERING PENSACOLA CLASS C AIRSPACE. I HAD FLT FOLLOWING AND THEY HAD 11500 FT AS MY ALT. I WAS AT 10500 FT CLRED TO DSND TO 3500 FT AND MANEUVER AS NEEDED FOR WX AVOIDANCE BY THE CTLR PRIOR TO PENSACOLA APCH. PENSACOLA TOLD ME THAT I WAS WELL BELOW MY ASSIGNED ALT AND OFF COURSE. I REQUESTED A CONTINUED DSCNT TO 2500 FT AND VECTORS TO PNS; THEN DIRECT TO PFN. APCH WAS TOLD THAT I WAS LNDG AT PNS AND THEY WERE MAD WHEN I ASKED FOR ROUTING FROM PNS TO PFN. I WAS DISTRACTED BY WX; COMS WITH FLT WATCH AND NAV. THIS COUPLED WITH THE CTLR'S ABRUPT TONE AND UNH;ELPFUL ATTITUDE CAUSED ME TO MAKE HDG AND ALT CHANGES THAT HE WAS NOT AWARE OF AND HE MADE ASSUMPTIONS ABOUT MY RTE AND INTENTIONS THAT WERE INCORRECT. I LEARNED A GREAT DEAL FROM THIS INCIDENT AND I WILL PLAN; FLY AND COMMUNICATE MUCH BETTER IN THE FUTURE.