SMA CAUGHT IN TURB CUMULUS BUILDUPS HAS ALTDEV.

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MAINTAINING 7000 FT; TURNED OVER TO DCA APCH OVER THE AML VOR; GIVEN VECTOR OF 120 DEGS; WHICH WOULD CLR BUILDUPS TO THE S OF MY COURSE. GIVEN VECTOR OF 160 DEGS THAT WOULD TAKE US INTO BUILDUP; ASKED TO DELAY VECTOR TO AVOID LARGE CUMULUS; CTLR BECAME ANGRY SAID; 'NO.' THEN GAVE ME A HDG OF 190 DEGS; INTO THE CLOUD; BUT I MADE A SLOW RATE OF TURN TO AVOID THE BUILDUP AND HE GAVE ME A HDG OF 200 DEGS -- HE WAS EVIDENTLY DETERMINED TO DRIVE ME THROUGH THAT CLOUD -- BUT I WAS ABLE TO AVOID A LARGE PORTION OF IT. HE GAVE ME A DSCNT TO 5000 FT AND A FURTHER TURN TO A HDG OF 210 DEGS. THIS PLACED ME ON A COLLISION COURSE WITH ANOTHER CUMULUS; ONLY THIS TIME I COULDN'T AVOID IT. THINGS GOT ROUGH AND I AGAIN ASKED FOR A DEV TO THE L; HE REFUSED. MY VERT DSCNT WOULD VARY FROM 1000 FPM CLB WITH PWR AT IDLE; TO CHK MY DSCNT WITHOUT EXCEEDING MY MANEUVERING SPD AND DSNDED TO APPROX 4300 FT BEFORE AIRPLANE LEVELED OFF. ABOUT THIS TIME HE BEGAN ASKING ME WHAT MY ALT WAS; I TOLD HIM 4300 FT ATTEMPTING TO CLB BACK TO 5000 FT.; AND I NEEDED A DEV TO THE L TO AVOID THE TURB -- HE REFUSED. I WAS ON VERGE OF DECLARING AN EMER WHEN HE GAVE ME A L TURN TO A HDG OF 120 DEGS AND A DSCNT TO 2500 FT WHICH GOT ME OUT OF THE TURB. HE GAVE ME ANOTHER VECTOR TO 090 DEGS AND A DSCNT TO 1600 FT. HE ALSO SAID TO CANCEL THE IFR FLT PLAN AT 1600 FT. WHEN I REPEATED THE CLRNC AND SAID I WOULD CANCEL THE IFR AT 1600 FT; HE SAID; 'YOUR IFR IS CANCELED NOW; CHANGE TO CODE 1200. KNOWING I WAS STILL IN CLASS B AIRSPACE; AND WOULD BE UNTIL I DROPPED BELOW 1500 FT MSL; I REPEATED HIS INSTRUCTIONS VERBATIM TO GET IT ON THE TAPE. DURING THIS ENTIRE EPISODE HE WAS RECEIVING AND GRANTING REQUESTS FOR DEVS FROM AIR CARRIER ACFT. THIS IS PREJUDICIAL; AND EXPOSED ME AND MY PAX TO UNDUE HAZARD. THIS CTLR WAS THE MOST UNPROFESSIONAL CTLR I EVER EXPERIENCED IN MY 35 YRS OF FLYING LARGE AND SMALL ACFT. I STRONGLY SUSPECT IF I WERE ON MY BAC 111 HE WOULD HAVE TREATED ME DIFFERENTLY. FORTUNATELY; HE IS A RARITY; THE MAJORITY OF CTLRS I KNOW OR WHO HAVE HANDLED ME; ARE GREAT. JUST AN ASIDE; DURING A CONVERSATION WITH A CTLR FRIEND HE MENTIONED THAT IF THERE ARE NO ECHOES IN THE AREA; THEY TREAT IT AS JUST TURB. I DISCUSSED CONTOURING WITH HIM AND HE APPRECIATED IT. MY CONCERN IS THAT OTHER CTLRS MAY BE UNDER THIS SAME ASSUMPTION; BECAUSE IN MY SIT TODAY; THE CLOUDS WERE IN THE CUMULUS STAGE AND TRANSITIONING TO THE MATURE STAGE. PERHAPS IF THE CTLR SAW NO ECHOES; HE MAY HAVE ASSUMED THERE WAS NO REAL DANGER. ADDITIONALLY; SINCE THE AIR CARRIERS WERE RPTING LIGHT TURB -- WHICH COULD BE MODERATE OR GREATER TO A SMALL AIRPLANE -- HE MAY HAVE CONSIDERED MY REQUESTS FOR DEVS AS DISCOMFORT: AFTER ALL; IT WAS ONLY TURB. PERHAPS A REVIEW OF CTLR'S TRAINING PROGRAMS WITH EMPHASIS ON RADAR INTERP AND THE DIFFERENT EFFECTS OF RPTED TURB (AS DESCRIBED IN THE AIM) ON LARGE OR SMALL AIRPLANES; WOULD AID IN AVOIDING WHAT I HAD EXPERIENCED TODAY.