Torrador bad service

We went to Torrador this morning like we usually do most of the time and we received the most humiliating service infront of the other customers, we ordered the Normal Cafe Latte and the hazelnut latte after which we asked the guy behind the counter making the coffee which one is which for a good reason, as we drink 3 sugars with a normal cafe latte and 1 sugar with a hazelnut latte. He mixed the 2 cups around so we ended up adding the wrong amount of sugar in each cup, we went back to tell him that it was incorrect so he said we should smell which one is which before we add the sugar, he then said he will make a new hazelnut latte after he helped all the other customers, so after a while of waiting he made a new hazelnut latte and told us that if we throw in 3 sugars the hazelnut will be too sweet, where we replied that we know it will be because we only throw one sugar in the hazelnut latte but he mixed it around when we asked him which one was the normal latte and which one was the hazelnut and he kept on making us feel we were making the mistake infront the customers after we clearly tried to explain why there is a reason for asking which one is which,is it too much to ask for?