Utter incompetence
A complete failure to understand how retail works
High stress
Panic
Zero patience for queues
Rants about shop assistants and other customers
Ineptitude with bank cards
Low tolerance of choice
Fury at inadequate/excessive options for purchase
Raving at traffic and traffic lights
Hatred of cyclists
Irritation at mask wearing with specs
Rants about Christmas
Inability to use hole in wall cash machine
etc.