If we're going by very stereotypical and shallow traditional gender roles, a woman who's a loser would be either 'fat' or a 'slut'.
because
Men=what you do+how much you earn
Women=what you look like/how pretty you are+have you lost your virginity yet/how 'pure' are you
but personally I judge a woman based on what she can do same as a man because we're both adults with brains and we live in the 21st century not a cave.
If a person is a loser it's usually because they exhibit what I see as some sort of really revolting personality trait-leeching off everyone else, hypocrite, liar, (Imo would add misogynist, racist, homophobic, neo-Nazi, aware these are more contentious) I could go on.JamieTT what are you trying to glean from these threads exactly?
edit: I've not once heard a man be called a 'loser' outside the context of 90s US soaps