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double standard

/ˌdʌb.əl ˈstæn.dəd/

a set of principles that applies differently and usually more rigorously to one group of people or circumstances than to another

对不同的群体有不同的一套标准，通常是对一个群体很宽容而对另一个群体很严格

especially : a code of morals that applies more severe standards of behavior to women than to men

尤其是指对女性的行为标准比对男性更严格的道德准则

She complained that her father had a double standard-her brothers were allowed to date, but she was not, even though she was older.

她抱怨她的父亲有双重标准——她的弟弟可以约会，但她不能，尽管她年长一些。