Bad attitude by China Center Greenstone Cashier

I received the most horrible service from a young Chinese cashier at the China Centre Greenstone. He didnt greet me when I approached him. I let that slide. He started throwing my items as he cashed them and I had to tell him not to do that, should he break anything I wouldnt hold myself liable. He gave me aggitated looks and continued to do the same thing until I repeated myself. I asked for the manager, but was told they're off. I said there has to be a stand-in. I reported it to a lady and it seems the young mans notorious for his foul behaviour. Nor was he dressed in uniform like other cashiers. His attitude is foul and distasteful.