NMAC BTWN A SKYDIVER SHORTS SKY VAN AND A TRAINING C150 IN THE TFC PATTERNS FOR 2 INTERSECTING RWYS AT BYRON; C-83; CA.

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SIMULTANEOUS LNDGS; AT PERPENDICULAR RWYS AT THE SAME TIME. I WAS DSNDING RAPIDLY IN THE PATTERN AFTER DROPPING SKYDIVERS. I RPTED SAME ON UNICOM IN DOWNWIND BASE AND FINAL. OTHER ACFT RPTED DOWNWIND TO PERPENDICULAR RWY AND WE SPOKE ABOUT OUR POS. AS I TURNED BASE TO FINAL; I VISUALLY LOCATED 2ND ACFT AT MY 12 O'CLOCK POS AND BEGAN TO WIDEN MY TURN TO THE L (MY L) AND I CALLED TO HIM MY POS AT 2 O'CLOCK POS RELATIVE TO HIS ACFT AS I TURNED BEHIND HIM TO AVOID A POTENTIAL MIDAIR COLLISION. HE DID NOT APPEAR TO ALTER HIS FLT PATH FROM HIS DOWNWIND HEADING. HIS FLT APPEARED TO BE A TRAINING FLT. HE SOUNDED LIKE THE CFI. I REACTED ACCORDING TO WHAT APPEARED. HE DID NOT HAVE ME IN SIGHT AND HE NEVER RPTED SUCH. MY BASE LEG WAS INTO THE EARLY EVENING SUNLIGHT. THE WEEKEND BOOGIE HAD A CURRENT NOTAM ON FILE FOR INTENSE SKYDIVING ACTIVITY FOR THE WEEKEND AT BYRON (C83) ARPT. THE GENTLEMAN VERBALIZED SARCASM AND INSINUATED THREATS TOWARDS ME ON UNICOM FREQ. I WILL CONTINUE TO TALK; LISTEN AND LOOK OUT MY WINDSHIELD AS MUCH AS POSSIBLE. I WILL CONTINUE TO BE A COURTEOUS PLT WHENEVER POSSIBLE; IN SPITE OF WHAT WOULD SEEM TO OTHERS; UNUSUAL FLT ATTITUDES IN RELATION TO CLBING AND DSNDING ACFT FOR SKYDIVING OPS.