The “golden rule” states that one should treat others as they wish others to treat them. This is a relatively valid argument and a stepping stone for a child learning morality, but it is not a completely valid stance of morality.
While treating others the way you wish for them to treat you works sometimes, it is not ethically valid and fails when one does not wish to be treated the way others do.
The golden rule is not ethical because does not offer any explanation or reason for why you are treating people in such a way. It may be attempting to evoke a sense of empathy, by showing that other people, like you, wish to be treated in a certain respectful way, and so they feel the same way you do, which makes them clearly similar to you as human brings. The problem is that this view is not reinforced or explicitly stated, and it can easily be missed, leading to the rule being an arbitrary social norm without ethical justification, rather than a natural moral obligation. If people only follow this rule because it is a rule, then they are not truly being morally good, but rather are simply following orders. This can lead to a lack of empathy and moral development.
The other issue with the golden rule is that it assumes that people want to be treated the same way. Many people want to be challenged, others prefer less resistance or effort, even if they’re not lazy. Some people wish for others to tell them when they are wrong, others get offended by it. Some people want lots of attention, others want to be left alone, and others want a certain amount of attention. This again does not promote empathy directly, as it tells you only to treat others how you want to be treated, rather than treating others how -they- want to be treated.
Instead of teaching children how to act, we should be teaching them why we act. The reasons for what we do are vitally important, because we act based on what we believe. A sociopath can do things that people with empathy do, but they do not understand why something is considered moral or immoral. Such a person cannot be trusted to make a moral decision because they inherently cannot understand the reasoning for it, they instead simply do what they are told id right to avoid getting in trouble. Morality must be founded in ethics, otherwise it is baseless and therefore unjustified and meaningless.
The golden rule might be a stepping stone to learn morality, but it is always better to learn empathy to assure a proper understanding of morality.