Friends who make you look bad in front of the opposite sex?

Is this an intentional thing? My friend made a very embarrassing comment about my appearance in front of a guy she likes as a joke the other day, and even he picked up on it and said "why you being rude to your poor friend." She denied being rude and said she was joking, but why do friends do this? Is it normal? I see it a lot between girls for some reason. They embarrass each other in front of guys.

Friends who make you look bad in front of the opposite sex?
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