Technically, they are probably correct, but the type of multitasking a pilot must exhibit is light years beyond what that cashier (or most anyone else) is expected to do.
Some people consider their ability to run a cash register and talk at the same time as “multitasking.”  Technically, they are probably correct, but the type of multitasking a pilot must exhibit is light years beyond what that cashier (or most anyone else) is expected to do.