A rude sales person

I wanted a grey denim, as I was busy looking for the size.A sales consultant over the cash desk starting asking me which size do I want. I rep**** as I was thinking she will come and assist me. But no She came with an attitude saying am looking at the wrong place. She was very loud, one of her colleagues heard everything even the other customers.She said they have stickers with numbers to show the sizes, and I can read very well, I didn't even mess up their flat packs, for her to come to me like I am some kind of a messy person. I then said to her why don't you help me, instead of you question me. I didn't like the way she treated me, I didn't like her attitude towards me. I'm not happy at all.