poor wingmanship
Poor wingmanship is the term used to denote uncooperative and unsupportive behavior between two or more friends at social gatherings such as bars, clubs, and/or parties. Not interfering when your friend interacts with unattractive or subpar choices of women or men, by allowing interaction to be carried out farther than polite social contact. When your friend is unable to make rational decisions regarding the person in question due to excessive inebriation and you fail to intervene, you are a poor wingman.
You let me take home that guy with big ears and bad teeth! Dude, that's poor wingmanship!