At least the Moo had the sense to be embarrassed when she called the genuinely deaf cashier deaf for not hearing her kid's mumbling.
Kids are dumb, they're indecisive, and they aren't going to be able to make up their mind in a hurry on the spot. I can't even make up my mind and I'm an adult - if my friends want to go to a specific restaurant, I ask for 1-2 business days to look at the menu in order to decide what to get. Whatever they order - even if it's something they normally eat - I guarantee they will eat two bites and either not touch the rest, play with it or throw it on the floor. Fucking just order for the kid and keep things moving.
I hated when I had to deal with this shit working as a library monkey. I had the kindergarteners and first graders and the librarian wanted them to scan their books themselves instead of just letting me do it, which would have been more efficient. But the kids were dumb - not their fault, I know - but they had no idea what to do and it took FOREVER to get them out the door.
Scan the book - no, the bar code. It's on the back. Take ten whole seconds to turn the book over because apparently it is their first time seeing a book every single time they come to the library. Scan again it's upside-down and the bar code is on the other end. It didn't scan, so run it under the scanner again because the kids don't have the sense or dexterity to aim the bar code at the scanner, or they do it at a snail's pace because they don't understand what scanning is and think the scanner is a laser or something. Lather, rinse, repeat for every child in a class of 25-30 students. COME ON I have shit to do and I get bitched at if I don't get everything done before I leave! God I don't miss that place.