FLT INSTRUCTOR EXPRESSED FRUSTRATION REGARDING UNPROFESSIONAL BEHAVIOR OF LCL CTLR AT OSU IN THE HANDLING OF A STUDENT PLT.

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I WAS INBOUND TO THE OSU ARPT. I WAS ACTING AS A FLT INSTRUCTOR AND WAS RETURNING FROM A LCL TRAINING FLT WITH MY STUDENT. WE RPTED SW OF THE FIELD AND WERE GIVEN SUBSEQUENT LNDG INSTRUCTIONS FROM THE TWR CTLR. WHILE MANEUVERING IN THE TFC PATTERN; I HEARD THE TWR CTLR ATTEMPTING TO CALL AN ACFT IN THE BLIND THAT WAS APPARENTLY INSIDE OSU'S CLASS D AIRSPACE WITHOUT CLRNC. THERE WAS NO RESPONSE TO THE CTLR'S RADIO CALLS. SHORTLY AFTER THAT; AN ACFT CALLED THE OSU TWR ADVISING 'STUDENT PLT' AND 2 MI OUT. THE TWR CTLR RESPONDED TO THE STUDENT PLT WITH INSTRUCTIONS AS WELL AS 'POSSIBLE PLTDEV;' BUT OFFERED NO EXPLANATION FOR THE 'POSSIBLE PLTDEV.' THERE WAS AN OBVIOUS TONE OF CONTEMPT FOR THE PLT IN THE TWR CTLR'S VOICE. THIS ONLY SERVED TO ADD ADDITIONAL STRESS TO THE PLT AND MAKE A BAD SIT WORSE. ON A SUBSEQUENT RADIO XMISSION FROM THE TWR CTLR TO THE STUDENT PLT; WHILE THE STUDENT PLT WAS STILL IN THE TFC PATTERN AND PRIOR TO LNDG; THE TWR CTLR ORDERED THE PLT TO 'CONTACT THE TWR' AFTER LNDG. THIS ADDED MORE STRESS TO THE STUDENT PLT. IT WAS OBVIOUS IN HIS VOICE. THE TWR CTLR'S TONE WAS AGGRESSIVE THROUGHOUT THE CONTACT. HIS ACTIONS WERE UNPROFESSIONAL. OBVIOUSLY THE DEV HAD TO BE ADDRESSED; BUT IT WOULD HAVE BEEN BETTER ADDRESSED ON THE GND. THE TWR CTLR TOOK A BAD SIT AND MADE IT WORSE. THIS HAD TO HAVE PLAYED A FACTOR IN HOW THE STUDENT PLT APCHED HIS LNDG. I HAVE ADDRESSED THE CTLR'S DEMEANOR OVER THE RADIO WITH THE OSU TWR SUPVR. HE HAS SEEMED TO BE A LITTLE MORE GUARDED WITH HIS WORDS; BUT HIS TONE IS STILL THE SAME.