A C172 INSTRUCTOR AND STUDENT MISUNDERSTOOD CLRNC AND TAXIED INTO POS INSTEAD OF HOLDING SHORT AT KENW.

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DURING THE AFTERNOON OF JAN/SAT/01; A STUDENT PLT AND I WERE PRACTICING FULL STOP TAXI BACKS AT THE KENOSHA REGIONAL ARPT IN KENOSHA; WI. AFTER COMPLETING A LNDG; WE WERE CLRED TO TAXI BACK TO RWY 24L. DURING OUR TAXI BACK TO THE ACTIVE RWY; A PLT WHO HAD JUST DEPARTED RWY 24R RPTED HAVING 'LOST HIS JACKET' DURING THE CLBOUT. THE CTLR OF THE CLASS D ARPT ENGAGED IN A CHATTY CONVERSATION WITH HIM. THE INFORMAL CONVERSATION BTWN THE CTLR AND THE CFI WAS OF THE MOST UNPROFESSIONAL TONE I HAVE EVER HEARD ON THE RADIO. IN THE MIDST OF THEIR CONVERSATION; MY STUDENT CALLED THE TWR READY FOR DEP. I WILL QUOTE THE RADIO CALLS BEGINNING WITH OUR CALL READY AT THE RWY IN THE WAY THAT I REMEMBER THEM. THE ACFT NUMBERS AND PERSONAL NAMES ARE CHANGED. AT THE TIME; THE ONLY OTHER ACFT IN THE PATTERN WAS THE ONE THAT LOST THE JACKET AND THAT ACFT WAS BEING OPERATED ON A PARALLEL RWY. ACFT: 'KENOSHA TWR; CESSNA ACFT X IS READY TO GO AT RWY 24L.' (NO RESPONSE.) ENW: 'ACFT Y; I'M TRYING TO SEE IF ARPT OPS AND CAN MAKE IT OUT TO PICK UP THAT JACKET. SO WHAT ALT DID IT BLOW OUT AT?' ACFT Y: 'OH I THINK IT WAS AROUND 500 FT ABOVE THE RWY. BUT THANKS TWR CTLR; I REALLY APPRECIATE THAT AND I'M REALLY SORRY TO CAUSE ALL THE PROBS TODAY.' ENW: 'HEY; NO PROB ACFT Y.' 'CESSNA ACFT X TAXI RWY 24L.' (HAVING CALLED READY TO GO AT RWY 24L MY STUDENT CORRECTLY ASSUMED THAT THE CALL IMPLIED TAXI INTO POS AND HOLD. IT SEEMS THAT OUR INITIAL CALL WAS MISSED BY THE CTL TWR DUE TO THE DISTRS RELATED TO THE JACKET.) ACFT X: 'TAXI INTO POS AND HOLD; ACFT X.' (ABOUT 1 MIN PASSES.) ENW: 'OK; I'M SENDING ARPT OPS OUT TO RETRIEVE THAT JACKET.' 'ACFT X; DON'T YOU EVER TAXI ONTO AN ACTIVE RWY! YOU DID NOT HAVE CLRNC. NOW MAKE L CLOSED TFC. YOU ARE CLRED FOR TKOF.' ALTHOUGH NOT THE EXACT DIALOGUE; I FEEL THAT THE IMPORTANCE OF SUMMARIZING THIS INCIDENT IS TO SHOW HOW A LACK OF PROFESSIONALISM ON BEHALF OF THE CTL TWR ENDANGERED THE LIVES OF MYSELF; MY STUDENT; AND POTENTIALLY THE LIVES OF OTHER PLTS. I UNDERSTAND MY MISTAKE IN ALLOWING MY STUDENT TO ASSUME AN IMPLICATION OF THE RADIO CALL FROM THE TWR.