I don't think you understand how children are taught.
Simply telling them how they should behave is not very successful. More successful techniques include modelling good behavior, positively reinforcing good behavior, and avoiding reinforcing bad behavior.
The writer's observation here is that by responding to impolite orders, the Echo is reinforcing bad behavior (if a child tries the same thing on a parent, they will generally not get want they are asking for).
Simply telling them how they should behave is not very successful. More successful techniques include modelling good behavior, positively reinforcing good behavior, and avoiding reinforcing bad behavior.
The writer's observation here is that by responding to impolite orders, the Echo is reinforcing bad behavior (if a child tries the same thing on a parent, they will generally not get want they are asking for).