I read it differently.I am absolutely fine with playing by the rules the not people have laid out.
Taking the “high road” has gotten us where we are today.
Option 1. Calmly ask for a manager and quietly and rationally explain the situation, your desired outcome, and ask for help. I seriously doubt store policy or union bakery rules prevent the sale of cupcakes between the hours of 3-5pm. Probable outcome: manager retrieves cupcake, apologizes, and offers free cupcake in gesture of human kindness; you leave happy; employees receive training update in next newsletter.
Option 2. Demand in irritated manner that minimum wage drone from other department perform a task they are demonstrably unqualified for. Vent frustration built up over days over unrelated issues and stomp off. Return home and use Internet to rant and paint entire grocery chain as hearlless monsters and specifically call out elderly employee for lack of understanding and physical disability. Probable outcome: no cupcake; no real satisfaction to you, other than starting an Internet fish-slapping contest; no improvement in store policy or performance.
The Internet and our cultural shift has created an atmosphere of incivility and unrest we may never recover from.
Deep breaths, everyone. Try to remember how people interact in a healthy way to overcome intermittent first-world inconveniences.