Taco Bell review: Customer service problem

Today, I purchased food at taco bell and was appalled at the rudeness of the server at this restaurant. The person in question was having a friendly conversation with the gentleman in front of me but their attitude and tone became completely different once it was my turn to order. The conversation prior to me was in full spanish. I do not speak spanish. Perhaps, that was the reason that I was greeted with a frown and essentially no manners or decorum whatsoever. It was terrible, especially that my young son was watching this and didn't understand what we might have done wrong to make the person upset.