Costa Coffee review: rude staff

I need to complain about a staff member in the Collier Crow branch as I'm shocked at how rude she was to me today.
I'd come from a hospital appointment, and by mistake I asked for a toffee nut latte to which she huffed, looked at the ceiling and told me "for god sake that's Starbucks".
I cant believe how rude she was to me so I walked out without a coffee or anything I wanted to buy.