Stella's parents stated that her curfew was midnight, whereas her twin brother, shane was allowed to stay out until 1: 00. her parents said that stella's earlier curfew was because "girls who stay out late get bad reputations – good girls shouldn't be out late." what concept is in play

Gender stereotyping 

Gender stereotyping refers to the practice of assuming the characteristics of an individual based on their gender. An example of gender stereotyping is "boys don't like pink" or "women don't like watching sports. Gender stereotyping is harmful because it can reinforce misogyny and shame men for not conforming to traditional masculine characteristics. 

'The parents of Stella here are projecting the gender stereotype of what is "good" or morally acceptable and what is "bad" or the taboos and deviance. This is an example of sexism in the household, where there are different rules depending on the gender of the child in question.