double standard
A set of rules, morals or principles that are unfairly applied to different groups or people.
Examples of double standards: (About a male boss): "I love his take-charge attitude!" (About a female boss): "She's such a bitch! She's probably on her period." (About a man who has sex): "What an awesome stud/legend/boss he is!" (About a woman who has sex): "What a disgusting slut/whore/skank she is!"
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