TFC CONFLICT OVER SILER INTXN NEAR DFW; TX.

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LOCATION: SILER INTXN. PLEASE REF EARLIER RPT FOR SAME FLT TUL-DFW. AFTER FILING EARLIER RPT; I CONTACTED DFW TRACON. I SPOKE WITH A SUPVR FAMILIAR WITH OUR CLOSE ENCOUNTER. THAT IS; CLOSE FOR ME 1/2 MI; NOT CLOSE FOR HIM. THE SUPVR DID NOT SHARE MY CONCERN AT ALL. HE ALSO SAID THAT 1/4 MI LATERAL SEPARATION IS FINE AT 11000 FT IF ONE PLANE SEES THE OTHER. HE WOULD NOT PROVIDE ME WITH THE INITIALS OF THE CTLR INVOLVED. WHAT DOES THAT TELL YOU? SAFETY IS NOT A CONCERN AT DFW TRACON. YES; I REALIZE THAT TRACON CAN MAKE MY LIFE MORE DIFFICULT THAN I CAN HURT THEIRS; BUT THERE IS NO EXCUSE FOR THIS; AND PLEASE UNDERSTAND WHEN I REFUSE A TRACON CTLR A JUMP SEAT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THIS RPT WAS 1 OF 2 RPTS SUBMITTED TO HIS AIRLINE. THE RPTR SAID THAT THE TFC INVOLVED WAS AN ACR CLRED TO DSND THROUGH HIS ALT AND IT PASSED BEHIND CAUSING A TCASII RA. AT THE TIME THE RPTR WAS UNDER ASSIGNED SPD CTL UNTIL HE BEGAN TO SLOW TO CROSS THE FIX AT 100 KTS BELOW THE PREVIOUS SPD. THE WX CONDITIONS WERE CLR AND THE OTHER ACFT RPTED VISUAL CONTACT WITH THE RPTR'S ACFT. THE MAIN CONCERN OF THE RPTR AFTER THE CONFLICT IS THE ATTITUDE OF THE SUPVR AT THE TRACON WHICH HE CONSIDERS TO BE LESS THAN PROFESSIONAL. HE IS CONCERNED THAT THIS ATTITUDE WILL BE SPREAD TO THOSE UNDER SUPERVISION OF THIS PERSON.