Intimidate me

I went to the store today to purchase a Ryobi Router and as previous times I would go to the back cashiers to pay for products if it is only one or 2 items because the lines in front is always long and I only have limited time. Today went and asked one of the 3 cashiers who can assist me so they show to whom I must go for assistance and a African lady helped me and while she was busy helping me one of the other cashier with the name (Sadene) and interrupt by being very sarcastic by asking me if I get special treatment because I must get special treatment from them and did the lady helping me asked to give me a plastic for the item while the was already plastic laying on the item and also speaks with a very unprofessional tone to me which made me so upset tht I lay a few words by her because it is not the first time I'm having a problem with this lady it's nw the second time. Very furious.<br>