Answer:Informal sanctions
Explanation:Informal sanctions are unwritten rules that the society has formed themselves without the enforcement by the official authority.
They are very common within society , the society uses them to control certain situations externally. Informal sanctions may be disapproval , shame , ridicule ,sarcasm.
The act of cutting a line is disapproved within society even if it is not a written rule but everyone is aware of it which is why this women is getting this reaction.
Informal sanctions are used to check deviant behavior.