Checkers Wilrogate - disrespectful employee

I am just so sick and tired of disrespectful staff working in well known outlets. Went to Checkers Wilrogate this afternoon and went to the deli section. I politely asked for some mixed loaf silces. Let me add that greeting a customer is something that this employee is unable to do. After kindly asking her if I may have some mixed loaf slices, she replies " no mixed". I then ask, excuse me? She then repeates as if I'm deaf: "no mixed!!!" I am certainly not deaf and dumb and let me be honest... she really ****ed me off! I placed my basket on the ground and left. No people s****s!! Too much effort to say something like "my apologies but we ran out"?? Or "sorry to dissapoint but..." Checkers, how do you do you find these people? It is very clear that your standards when employing an individual is very low. After many years visiting this particular Checkers, I will never return...let's be clear on that!