DISPATCHER AT MAJOR ACR COMPLAINS THAT NON OPERATIONAL DEPTS COMPLICATE HER JOB BY DEMANDING JUSTIFICATION FOR OPERATIONAL DECISIONS ABOUT WHICH THEY HAVE NO EXPERTISE AND THAT; BY DEFINITION; THEY DO SO AT TIMES WHEN HER WORKLOAD AND PRIORITIES ARE HIGHEST. FEELS THAT THEIR INTERFERENCE ERODES HER ABILITY TO PERFORM HER DUTIES IN A SAFE MANNER.

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A FLT I WAS WORKING SENT ME AN ACARS MESSAGE IN WHICH THE CREW POINTED OUT THE CURRENT SAN WX AT OVCST 007 2-1/2 BROKEN AND ONLY NON PRECISION APCHS AVAILABLE. OUR CREWS ARE CURRENTLY LIMITED TO CDAP MINIMA; 800 FT 2 MI FOR NON PRECISION APCHS. I TOLD THEM (SOMETHING LIKE) IF SAN TWR COULD NOT CONFIRM CEILING AT 800 FT BY THE TIME THEY WERE READY FOR AN APCH THEN THEY WOULD HAVE TO DIVERT TO LAX; WHICH THEY ENDED UP DOING. IMMEDIATELY AFTER ENTERING THE 'US' DIVERSION CODE THE PHONE RANG; OPS WANTED TO KNOW WHY THE FLT HAD DIVERTED BECAUSE A SAN STATION AGENT TOLD HER THAT THE 'WX IS VFR' AND THE 'OTHER AIRLINES' WERE 'LNDG JUST FINE.' I TOLD HER THE WX MINIMUMS WERE TOO LOW FOR A LEGAL APCH SO THE FLT HAD NO CHOICE. SHE INSISTED REPEATEDLY THAT I EXPLAIN IT TO HER SATISFACTION. FINALLY; I TOLD HER I WAS TOO BUSY TO EXPLAIN IT TO HER AND HUNG UP. MEANWHILE; I HAD MY HANDS FULL WITH 10 OTHER FLTS REQUIRING MULTIPLE FLT PLANS FOR NUMEROUS ATC RE-RTES; SEVERE WX AND TORNADO WARNINGS ENRTE; PAYLOAD INCREASES; MAINT DEFERRALS/APPROVALS/AMENDMENTS; PHONE CALLS FROM LOAD PLANNERS; PLTS; MECHS ET AL; AND ACARS UPDATES/BRIEFINGS/AMENDMENTS TO THE OTHER FLTS TRYING TO DEPART. THE WORKLOAD WAS VERY HIGH. THIS IS A RECURRING ISSUE: JUST WHEN I AM THE MOST BUSY TRYING TO HANDLE DIVERSIONS SAFELY AND QUICKLY IS WHEN SYS OPS CALLS ME AND DEMANDS EXPLANATIONS. THEY ARE NOT ONLY INTERFERING WITH MY MORE IMPORTANT DUTIES AND RESPONSIBILITIES; THEY ARE ALSO QUESTIONING THE DECISIONS THE CAPT AND I HAVE MADE ABOUT THE SAFETY AND LEGALITY OF EACH FLT. IT IS NOT MY RESPONSIBILITY TO EDUCATE CLERKS AND AGENTS ABOUT FARS; WX; OR APCH MINIMUMS; NOR DO THEY NEED TO UNDERSTAND EVERY DETAIL. THEY ARE SO QUICK TO PHONE ME THAT I HAVE NO OPPORTUNITY TO NOTIFY THEM MYSELF; AND IT HAPPENS; EVERY TIME; I HAVE A DIVERSION. I HAVE SEVERE WX WARNINGS TO ISSUE TO MY FLTS AND YET THERE I WAS TIED UP ON A NON-ESSENTIAL TELEPHONE CALL.