Those learning languages must learn rules about how to order words. sociologists call those rules

Sociologists call those rules "norms".

Norms characterize how to carry on as per what a general public has characterized as good, right, and critical, and most individuals from the general public cling to them. For instance, when purchasing food or boarding a transport. These models portray the noticeable and imperceptible standards of conduct through which social orders are organized, or what sociologists call norms.

nigger, that word was originated for white folks   to keep black people under

and when black people use it, they know that's just how they greet each other

and when white folks use it, they know there's a double meaning under