The fact she took a photo of her own reg implies: 1) it's a new (to the driver) car, hence potentially still unfamiliar with the workings, including how charging works, how much time it takes, etc, and/or 2) the driver is a bit hopeless/disorganised (can't remember own reg). If either of those situations is true, I don't blame her (well I'd blame her for being disorganised, but some people are just like that, it's not really their fault). These (EV charging etiquette) are tricky new waters we're navigating, and I suspect there is a *lot* more pain ahead (we're only at the beginning!).
As far as expecting someone to interrupt their meal to move their car in this situation, that's incredibly rude -- a meal is a sacred thing, and the five minutes it would take to move the car are the difference between a relaxed warm meal, and a rushed cold one. I can understand having to move a car because it's blocking something important, but to give someone else access to a charger, no way.