The rule of law generally refers to societies where everyone is subject to the same set of laws. China, for example, does not and has not had the rule of law. Instead they have rule BY law, where laws are simply to control certain people’s behavior.
You may have heard of "no one is above the law" or "all are equal before the law", this is the quintessence of it. There is no king above the law, if there is the rule of law.
The comment was about the abuse of “law” towards minorities. So go learn about how police departments are trained to seek and destroy these communities.