She knows what a garbage disposal is. It’s just another example of her intentionally saying stupid so she can play the victim when called out on it.
Maybe she doesn’t, it is my understanding that on the east coast they are not very popular. However, west of the Rockies (and probably west of the Mississippi), they are de rigueur. Here on the left coast, perhaps for the first time, she appears very silly. She would do well to remember, should she decide to run for national office (God forbid), that way out west (and maybe way out midwest) garbage disposals are considered a necessity for everyone who has kitchen and actually cooks in it. If she tries to create federal legislation to ban garbage disposals, she actually might kill off the democrat party for good. Silly silly girl!