Long queue cashier not assisting

Hi Was at pep home keywest on Saturday morning they was 2 cashiers working when it was my turn to pay after patiently queuing the cashier started packing for the other cashier while she was assisting another customer I walked towards the till and asked her to assist me and she said she's not working on till I am so passed off coz I saw her assisting someone else and I also feel that she was very rude I wish cashiers can just treat us the same whether black or white her name is Felicia