I've never understood people that need to make their friends feel bad about themselves. As a feminist, our responsibility is to BUILD up other women and help powerful women reach their full potential. This can't be done when you're bashing your friends' outfit choice or making fun of her boyfriend. A good gal pal is supportive and truly wants the best for her friends. She would never make someone feel less important than herself.
Real women accept people's quirks and try to help them become better people.
A true gal pal is there when your boyfriend breaks up with you and doesn't talk sh*t about you. True feminists understand that women are disadvantaged in American society, and bashing others' appearances just plays into our societal expectation. Our society constantly judges women and places pressure on them, yet there's not a ton of support out there for women.
The whole point of friendships is to support each other. As humans, we love emotional support and people that deeply care about us. It's important for our friendships to be a place of trust, respect, and comfort. We don't want to be friends with someone who talks sh*t behind our backs and pretends to be supportive but really isn't. I have had many friends that I thought were incredibly supportive until a mutual friend informed me that they were talking sh*t behind my back. It's so frustrating to trust someone with your secrets and have them IMMEDIATELY tell everyone else JUST so they can bash you.
So, if you're the one bashing your friends on their appearances or their behavior behind their backs, it's time to stop. You need to talk out your issues with this person or you need to accept them how they are. Otherwise, why are you even their friend in the first place?