The airport ATC I am refering to is located in south east Manitoba and sometimes the controller sounded outright annoyed that I was there. I was flying cross country one day and the controller kept querying me was I maintaining my assigned altitude.Now I was still learning it was only varying by a hundred feet or so but the terminal controller sounded quite rude about it.There were also times Iwe were outright refused to entry to do some night time touch and gos which is frustrating given the money I had to pay for the aircraft.