C172 INSTRUCTOR AND STUDENT EXITED RWY 31 ONTO RWY 27R AT PBI AFTER THE ATCT LCL CTLR BECAME UPSET THEY MISSED A LAST SECOND CLRNC TO CLR THE RWY ON TXWY G.

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I WAS WITH A STUDENT ON AN APCH AND FULL STOP LNDG AT PBI ARPT; FL. WE LANDED (LONG) ON RWY 31. I BELIEVE THE CTLR FELT THAT WE WERE ABLE TO MAKE THE FIRST TXWY AT TXWY G; HOWEVER; DUE TO A DISPLACED THRESHOLD AND A STUDENT PLT LNDG; WE WENT PAST TXWY G. JUST BEYOND TXWY G; THE CTLR; IN A LOUD AND UNPROFESSIONAL MANNER; SHOUTED TO EXPEDITE. WE UNDERSTOOD THAT (IN THE MANNER; TONE THAT THE COMMAND WAS GIVEN) TO MEAN OFF THE RWY ASAP. WE THOUGHT THAT ANOTHER ACFT WAS LNDG ON RWY 31 BEHIND US. WE EXITED ON THE FIRST INTXN THAT WE CAME TO (RWY 27R/9L). HOWEVER; THEN THE CTLR YELLED AT THE TOP OF HER LUNGS 'EXPEDITE' AGAIN WITH NO FURTHER ASSISTANCE. I/WE THEN PWRED THE ACFT (ONLY BEING ON RWY 27R/9L FOR ABOUT 10 SECONDS) AND EXITED OFF THE TXWY F; N OF RWY 9L/27R. AT THIS JUNCTION; WE STOPPED. WE WERE THEN INSTRUCTED TO PERFORM A 180 DEG TURN. AT THIS POINT WE DID HAVE OUR ARPT DIAGRAMS OUT AND UNDERSTOOD OUR ORIENTATION WAS ON TXWY F. WE DID SEE ANOTHER ACFT ON TXWY C AND BELIEVED THAT WAS THE REASON FOR THE 180 DEG TURN. HOWEVER; WE DISCOVERED LATER (WHEN ON THE GND) THAT THE COMMAND FROM THE CTLR TO PERFORM THE 180 DEG TURN BROUGHT US BACK OVER THE HOLD SHORT LINE OF RWY 27R/9L. I DID REACT TO ENSURE THE SAFETY OF THE ACFT AS A RESULT OF THE CTLR'S TONE. AFTER SPEAKING TO THE WATCH SUPVR; HE DID FEEL THAT HER TONE WAS NOT APPROPRIATE AND THE ACFT THAT WAS CLRED FOR RWY 27R WAS A 'TIGHT APCH;' SINCE WE WERE GIVEN NO HOLD SHORT INSTRUCTIONS PRIOR TO RWY 27R.