About 30 minutes into these touch and goes, one requested a stop and go. I could not have five aircraft doing touch and goes with one doing a stop and go; it would mess up the pattern and Id be making student pilots do a lot they didnt need to. So, I come back with, Unable. I have five of yall. He came back with, Well we need to do stop and goes for training. I thought about putting that one airplane on the other runway, but I had started to have a line of departures and arrivals. Unable, I repeated. I thought the matter was closed, as it should have been.