NMAC BTWN A C172 JUST BREAKING OUT OF CLOUDS ON AN ILS FINAL APCH AND A C15O PASSING OFF THE R WING.

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I WAS FLYING IFR WITH A SAFETY PLT. WE HAD BEEN IN AND OUT OF THE CLOUDS THROUGHOUT THE FLT. ON FINAL APCH FOR AN ILS WE HAD JUST DSNDED BELOW THE CLOUDS WHEN MY SAFETY PLT TOLD ME THAT WE HAD SOME REALLY CLOSE TFC. I LOOKED UP IN TIME TO SEE A C150 PASS ABOUT 50 FT OFF MY R WING. I RPTED THIS TO TWR; AND THEY SAID THEY WEREN'T TALKING TO HIM. I LANDED RIGHT BEHIND THE ROGUE CESSNA AND ASKED THE GND CTLR FOR HIS FULL TAIL NUMBER SO THAT I COULD RPT THE NEAR MISS. GND INSTEAD GAVE ME A PHONE NUMBER AND ASKED ME TO CALL THE TWR SUPVR. WHEN I CALLED THE TWR; THE SUPVR TOLD ME THAT THE PLT HAD BEEN TOLD TO FOLLOW ME. HE APOLOGIZED FOR LETTING HIM GET SO CLOSE; AND ASSURED ME THAT THE SIT WAS BEING HANDLED. WHEN I ASKED WHAT I NEEDED TO DO TO RPT THE NMAC THE SUPVR BECAME DEFENSIVE. HE SAID THAT IF I WANTED TO CALL IT AN NMAC THEN THAT COMPLICATED THINGS A LOT MORE; BUT IF I JUST DIDN'T USE THOSE WORDS THEN THE TWR COULD HANDLE IT INTERNALLY. THE OTHER ACFT WAS BEING FLOWN BY A SOLO STUDENT PLT. I ASKED AROUND AND SPOKE TO HIS FLT INSTRUCTOR. THE STUDENT DIDN'T SPEAK MUCH ENGLISH; AND WAS ON HIS FIRST SOLO IN CTLED AIRSPACE. THE TWR PUT HIM ABOUT 1 MI BEHIND ME; AND TOLD HIM TO FOLLOW ME IN. THE STUDENT WAS FRIGHTENED AND CONFUSED; SO WHEN TWR TOLD HIM FOR THE SECOND TIME TO FOLLOW ME; HE JUST SAID 'ROGER.' I WORK AT ANOTHER FLT SCHOOL ON THE FIELD; SO I'M NOT INTERESTED IN CAUSING TROUBLE WITH THE CTLRS. I WOULD SORT OF LIKE TO SEE AN ENFORCEMENT ACTION AGAINST A RIVAL FLT SCHOOL; BUT I DON'T THINK THAT WOULD HELP THINGS IN THIS CASE. THIS FLT SCHOOL IS KNOWN FOR IMPORTING FOREIGN FLT STUDENTS; AND WE OFTEN HAVE COMS PROBS WITH THEM. I THINK THAT STUDENT PLTS SHOULD BE REQUIRED TO SPEAK ENGLISH JUST LIKE ALL OTHER PLTS. I'M ALSO CONFUSED ABOUT THE DEFINITIONS. I THOUGHT THAT AN NMAC WAS ANYTHING CLOSER THAN 500 FT. HOW DOES WHAT I CALL IT CHANGE WHAT IT IS? I FEEL I HAVE AN OBLIGATION TO RPT THESE THINGS SO THAT FUTURE INCIDENTS CAN BE PREVENTED.