Dollar Tree

I am writing this complaint in regards to customer service at one of your stores in Compton, California store #5484 sales associate Zulema. On 6/6/23 there were 2 registers being used to check out the customers, 1 register #3 had it's light on and was assisting customers and had a long line which extended down the aisle, the second register #4 did not have it's light on, but the clerk would assist customers by "stating next in line on register 4". I observed this for about 4-5 customers. Shortly thereafter a young hispanic lady walked up to line #4 and clearly saw all of us waiting in one line to be served and I stated the line is back here, the young lady looked at us and looked at the clerk and the clerk told her "I can help you" so at this time I became furious and stated well then I'm next in line and placed my items on the counter at register 4, but she (Zulema) continued to service the hispanic young, no apology was given in fact she did not say anything. I told her if you do things correct and in order you can prevent unnecessary problems and that if her line was open then she should turn on her light so that all customers would know that she was open instead of showing bias to a certain nationality. I feel this was poor customer service and has no place in society and in the workplace that's especially made up in a community that has diversity among it's citizens. As I was completing my transaction, an African American young lady asked her if they had a certain item and Zulema was very rude to her when she responded "well if you didn't see it back there, then we don't have it".