One of the writing exercises of the playwriting group I attend was to write a quick 10 minute monologue based on one of two themes; 'Knife Fight' or 'Bad Service'.
Unlike a previous topic where nothing had sprung to mind, here I was instantly reminded of my delightful experiences with a tour guide in St Paul's. As a tour guide her job revolved around customer service, otherwise no one would have been on her tours, and yet as someone who was not a customer but was still affected by her service, I was immensely displeased. And so in my response to her actions, I felt justified.
I doubt there are many who did what I did, but I'm sure there are many who would have been as irritated. This is just the well structured verbalisation of that irritation.